Corcu Loígde DNA Project

Pre-Eóganachta Rulers of Munster, Ireland
  • 208 members


Last Updated: August 11, 2019

BEFORE CLICKING JOIN: Read and follow through on these project requirements completely. Your full cooperation is ESSENTIAL. THANK YOU!

Prospective members must provide written permission IN THE JOIN WINDOW to utilize their anonymized results in project publications and presentations WHEN THEY CLICK JOIN. The specific language to use is described below. No one is admitted until that written permission is in the JOIN REQUEST. See Privacy Concerns if you are worried about personal information on the Internet.

If your kit is admitted but your account and family tree are not sufficiently prepared to participate in this study, your account will be removed from the project and you will be asked to join when you are prepared.

Email Susan (project administrator) a BRIEF (300 words or less) email BEFORE clicking JOIN if you have questions after reviewing these requirements.


We're always interested in new, eligible members who are interested in contributing to historical research and sharing their data. If you meet all the requirements and are an Ireland history buff, you are an exceptional candidate.

Our project surveys the Y chromosome DNA of men bearing surnames associated with the Corca Laidhe, an ancient people who lived and ruled in Munster, Ireland. Their pedigree allegedly begins with Lughaidh Maccon who died in 225 AD. Their genealogy from about the 1100's was recorded in the 1400's, translated from Irish to English in the 1800's, and is now online in both scanned and digital format (see Links). See the Background page for more detailed information.

Over time some members may be determined to have 'Corca Laidhe DNA' (mutation patterns on the Y chromosome believed to have been present among the Corca Laidhe when they ruled Munster) and some not.

We are interested in ALL these results, so please stay in the project if you've been accepted, even if you aren't determined to have a Corca Laidhe haplotype.


QUESTIONS on project eligibility, FTDNA account setup, and more.

  1. What special permission must I give to the project when I join?

  2. I have privacy concerns. Will my name / contact information be on the Internet?

  3. What is the purpose of the project, who is eligible to join, and what are the requirements?

  4. What are the Y testing requirement details?

  5. How should I set up my FTDNA Contact Information?

  6. How do I upload a family tree into my FTDNA account?

  7. How do I set up my earliest known paternal ancestor?

  8. How do I give the administrators access to my data?

  9. How do I share out my paternal ancestry and Y results?

  10. How do I share out my family tree?

  11. How do I contact the project administrators?

  12. How does the project communicate with members?

  13. Are there any opportunities for Y testing financial assistance?


  1. If YOU are the tester supervising your OWN FTDNA account, COPY AND PASTE THE FOLLOWING TEXT INTO THE JOIN WINDOW when you click JOIN:

    The Corca Laidhe Y DNA Regional Project is hereby granted permission to utilize my ANONYMIZED Y results, paternal line family history and paternal line origins in published research on Internet websites, published papers, and talks and conferences that are not affiliated with FTDNA.

    If YOU are the tester supervising the FTDNA account of SOMEONE ELSE, complete the following text in an editor. Then COPY AND PASTE YOUR COMPLETED TEXT INTO THE JOIN WINDOW when you click JOIN:

    The Corca Laidhe Y DNA Regional Project is hereby granted permission to utilize [TESTER'S NAME]'s ANONYMIZED Y results, paternal line family history and paternal line origins in published research on Internet websites, published papers, and talks and conferences that are not affiliated with FTDNA. My name is [SUPERVISOR'S NAME]. I am a [RELATIONSHIP: daughter, cousin, wife, etc] of the tester and have authorization to handle his data.
  2. The project's Y results are accessible under Y DNA Results of the left sidebar. Your data is tagged with a kit number, anonymizing your results. Your name and email are not published. This is the typical display of Y results in most FTDNA projects so this project is not different in that regard. What IS different is that this project REQUIRES that you OPT IN to share your results so they are publicly available.

    Names and contact information are not published either within the FTDNA pages or in external publications. All FTDNA project administrators have signed agreements to not disclose your personal information.

    Your super-anonymized data utilized in any project media productions will probably be in a haplogroup table or tree, or be drawn as a color or shape coded point on a map. Your data will be tagged with a Y DNA haplogroup, Corca Laidhe surname, and maybe earliest known ancestor.

    For examples of DNA map graphics, see:

    Cork Ireland project mitochondrial DNA study

    Irish DNA Atlas Study published in Nature

  3. This an advanced project for experienced testers and FTDNA users who:
    i) have some experience with Y testing
    ii) have experience using genealogical resources to research their paternal lines
    iii) are willing to share their family trees with their matches and their anonymized data for Corca Laidhe research publications and presentations AND GIVE WRITTEN PERMISSION TO DO SO.

    The full tracing of your paternal line ancestry back to a specific location in the British Isles is enormously helpful but is NOT REQUIRED. Not all of us are that fortunate to be able to do so.

    Our Background page gives a brief history of the Corca Laidhe region. Our Goals page gives our stated goals.

    Giving Written Permission for Published Research. Upon clicking JOIN, you must provide written permission IN THE JOIN WINDOW for your results to be used in published research in venues not affiliated with FTDNA and beyond the confines of the FTDNA website. See details above.

    Surname. The tester's last name must be in our list of surnames. If you are a Y DNA match to someone with a Corca Laidhe surname, that does not make you eligible.

    Familiarity with FTDNA Account. You must know how to edit your family tree and account settings in your FTDNA account, or be willing and able to learn to do so. Written and illustrated instructions are included below.

    Interest Level. Members should have an inherent continuing interest in the history of the Corca Laidhe region (roughly the south part of Munster, the southernmost province of Ireland), otherwise they may lose interest and leave the project.

    Research Experience. You are NOT necessarily expected to know exactly where your earliest known paternal line ancestor came from in the British Isles. However, you are expected to be experienced with genealogy record sources and to have researched your paternal line, even if only back two or three generations. If your research is "stuck" in the Americas, or Australia, or elsewhere in the British Isles diaspora, and you have not been able to progress further back to a British Isles origin, that's okay. We anticipate that you'll keep working on your research. The requirement is that your account documents what you DO know.

    Y DNA Testing. A Y DNA STR test of 37 markers or more is required upon enrollment. The project wants men interested in and committed to more extensive Y testing and are willing to take Big Y, the SNP discovery test, given the optimal financial circumstances. See details below.

    Contact Information. The tester's name must be in the Contact Information. If you are monitoring the test for someone else, your name should be included in the NAME field. If you use more than one email they should be included in the primary email field. See details below.

    Paternal Ancestor Origins. Your earliest known paternal line ancestor must be documented in your account. A name, approximate year of birth, and location should be provided. Country of Origin and geographic coordinates must be set.

    As you learn more about your earliest known paternal ancestor your data should be updated accordingly. See details below.

    Paternal Line Family History Documentation. Your account family tree must minimally contain your paternal line history. Men, their spouses, approximate birth and death dates, and locations should be in place. You are expected to provide as much detail as possible to the townland or township, village, civil parish, district, shire, county, or province if possible.

    As you learn more about your paternal line history you can update your family tree in your account. See details below.

    LIMITED Access Permission. Upon clicking JOIN you'll grant LIMITED access to the project administrators. It is expected that you will maintain that access level for the administrators.

    If you are somehow admitted without setting access permission, you will need to manually do it. See details below.

    Public Sharing of Anonymized Data. Your anonymized data must be publicly shared so project reviewers and other interested parties may review our data. See details below.


    DNA Data

  4. Y testing needs to be done at FTDNA so your results are integrated into the database and are fully enabled for matches.

    Y minimum of 37 markers is required. Transfers of SNPs from elsewhere and straight transfers of STR markers without upgrades at FTDNA are not sufficient.

    If you have access to old Y DNA data from or from any lab that used the Sorenson 33 or 46 marker test, you may transfer it to FTDNA. A straight transfer is not sufficient. In order for it to qualify for the project, you must order a transfer+upgrade product and do a swab from FTDNA so that your results will be better aligned with FTDNA's test and so that you'll be enabled for matches in FTDNA's database. See: Transfer DNA and also the $58 transfer+upgrade Y products.

    If your transfer+upgrade produces less than 37 markers you will need to perform a Y25 to Y37 marker upgrade at FTDNA to be eligible for the project.

    The project will be relying increasingly on Big Y, the SNP discovery test. Yes, we know it is expensive. Hopefully, there will be future sales, and competitive pressures to push the price down. We suggest saving up for it over time, and ask friends and relatives who want to give you a gift to contribute to your testing "kitty". Hold on to that collection for the next good sale opportunity. Big Y testing will also complete your STR marker testing. The price will vary, depending on how much STR testing you've completed.

    We do not:
    - Provide support for genealogical research
    - Accept autosomal DNA or mtDNA results
    - Accept transferred Y STR data not UPGRADED AND INTEGRATED into FTDNA
    - Accept Y SNP only transfers
    - Accept Y DNA for non-Corcu Laidhe surnames just because it matches men with Corcu Laidhe surnames


    Your Contact Information

  5. Click Account Settings | Account Information. Under Contact Information | My Personal Story, state who you are and where your project surname lineage was from. If you are not the tester, state how you are related to the tester.

    If you are supervising the test for someone else, enter the tester's name. Under Middle Name, enter C/O Your Name. Example: John C/O Jane Smith Driscoll.

    The LAST NAME field should contain ONLY the last name of the tester, so that any surname reports FTDNA generates will contain more accurate information.

    Make sure all the emails on the account are up to date and that your primary email is accurate. If more than one person is accessing your account, please put TWO emails in the primary email field. Separate them with a comma (,). Example:,

    If we were to get inquiries about certain kits in the project, we cannot answer questions unless the setup of your Contact Information is consistent with what we see in any inquiry email. Project administrators are not able to open up and view all your Contact Information. The only Contact Information we can see in our member roster is whatever you enter in the name field and primary email field. Please do not stuff other names into address or phone fields or secondary email fields. The administrators cannot see that information!

    Kits set up this way not only save your project administrators time, it helps minimize the risk of data breaches committed by present and future administrators in ALL of your projects.


    Family History Documentation

    A detailed family tree should be inside your account - ESPECIALLY if you also do autosomal testing. If you don't publish your tree and build in your known DNA matches, you are missing out on the match linking / triangulation feature in your FTDNA account, which could give you major clues on how other autosomal matches are related to you.

    Quality of data is more important than quantity. Fill out name, place, and date details that you DO know, even if you have not necessarily traced your paternal line origins back to Ireland or elsewhere in the British Isles, or have only researched back one or two generations. If you can fill out places down to the county, shire, district, parish, village or townland or township, all the better. Use of the NOTE fields in the records in your family tree is strongly encouraged.

  6. You can use the built-in editor to create a family tree if you want. At minimum, the project needs the paternal line of ascent. However, it is more time-effective to produce a GEDCOM file externally and upload it into your FTDNA account.

    To export a GEDCOM file out of

    1. Log in to your Ancestry account.
    2. Under Family Trees, click the tree to export.
    3. Under Tree Settings, view Manage your tree.
    4. Click where it says Export Tree.
    5. Save the GEDCOM file on your computer.

    To create a GEDCOM file from scratch, try one of the following programs:

    1. MyHeritage Tree Builder (free)
    2. GenealogyJ (free)
    3. Personal Ancestral File (free for Macs; no longer supported)
    4. Ancestral Quest
    5. Legacy Family Tree (compatible with Family Search Family Tree)
    6. Family Tree Maker ( product; support outsourced)

    To upload your GEDCOM, in your FTDNA account, click myFamilyTree. Click the Upload GEDCOM icon then choose the GEDCOM file on your computer to upload it.

    To adjust the privacy settings on your family tree, click the Cog wheel where it says Settings.

  7. The project wants your paternal ancestor set up with as much detail as possible, including Country of Origin and GPS coordinates. These pieces of information might help populate the FTDNA Y Haplotree.

    It's perfectly fine if you've only researched back two or three generations or that you haven't found your paternal line origins in the British Isles. Details matter. As you continue investigating your paternal line and discover older generations, you can update this information accordingly.

    Access Account Settings | Genealogy | Earliest Known Ancestors and click.


    - Click save (bottom left; not shown).

    - Click Update Location (on the right).

    - Now underneath the map, on the left side for Paternal, click edit location.


    Under Direct Paternal Ancestor, enter the earliest known ancestor name; a birth, marriage, or death year; and a location.

    - Enter a Country of Origin.


    - Under Step 1 - Choose Ancestor Type, click update paternal location (lower left; not shown).

    - If you already entered your ancestor's name, date, and abbreviated location, click next to skip this step.

    - If you didn't enter it before, under Step 2 - Update Paternal Information, enter the ancestor name, an approximate birth or death date, and a location. See the left graphic for one example.

    Here is another example:
    Martin Smith b.c. 1800 l. Hamilton Co, OH, USA

    - Click next to save your information or skip Step 2.


    - Under Step 3 - Find a Location on the Map, enter a known location for your paternal ancestor - where he might have been born, resided or died. You can use the location search tool built into FTDNA, or you can customize your own latitude and longitude by using a tool such as getLatLong to zoom to and get the coordinates of your own location. If your ancestor came from a townland with a frequently used name (e.g., Scart) please customize it.

    - Whichever way you enter the location, click search.

    - Click select on the map.

    Under Step 4, enter the display format of the location that you want to use on the map, e.g., Gortnascreeny, Caheragh, Co Cork, Ireland. Click next.
    Under Step 5, review all the information you entered for accuracy, and click save & exit.

    Sharing Data

  8. Make sure that LIMITED or better access for the Corca Laide project administrators in maintained. MINIMAL access is not acceptable.

    3. Under Your Projects, locate the Corca Laidhe project and click Edit. Then follow the prompts to grant access.

    See also: Project Group Preferences Page.

    See also: Project Administrator Settings Page.

  9. Access Account Settings | Project Preferences | Project Sharing | Group Project Profile, then check the box Opt in to Sharing. It is a project policy that anonymized results are public.

  10. Access Account Settings | Privacy and Sharing and scroll down to Family Tree Sharing. Share your family tree with ONLY MATCHES.

    We do not know the effects of setting Family Tree Sharing to All FamilyTreeDNA Users. At one time, the FTDNA website had a site wide family tree search feature. That feature has since been removed but presumably it could be reimplemented. If you do not wish the visibility of your family tree to go beyond your matches, we recommend the ONLY MATCHES setting.



  11. Susan's and Martha's emails are available off our FTDNA ABOUT page, in the left column.

    Copy and paste the keywords CORCA LAIDHE PROJECT into the SUBJECT LINE of your email. If you are a project member add your FTDNA Kit Number to the SUBJECT LINE.

    *** Emails without the subject line keywords run the risk of being deleted through a spam filter. ***


  12. Effective in 2019, the project will no longer send out detailed announcements via bulk emails. Instead, brief bulk emails will be sent out notifying members to read the NEWEST announcements on the BULLETIN tab of the Corca Laidhe FTDNA site. Prior communications on the BULLETIN tab will be stored under the UPDATES tab so members can conveniently review prior project announcements in one place.

    Members must log in to their FTDNA accounts and visit the Corca Laidhe FTDNA website in order to be able to view the BULLETIN and UPDATES pages. Click ABOUT in the left sidebar to access Members-Only pages.

    The reason for this change is to have greater control over the content, viewability and appearance of what would be the bulk email content, and also to store prior communications in one convenient place for members.

    The project maintains an Activity Feed by which members may communicate with one another. The administrators will also utilize the Activity Feed reminding members to check the UPDATES tab for announcements they may have missed.


    Y DNA Testing Scholarships

  13. The project does not give away free Y tests at DNA shows.

    During major sales, the project will fund $150 towards qualified members for their Big Y test, subject to fund availability. Requirements for this funding opportunity:

    • Documented paternal line ancestry from County Cork; as the project learns more, the geographic requirement may be adjusted.

    • Paternal line ancestry is documented back at least to Tithe Books and at least to a civil parish.

    • Must be able to produce basic paternal line documentation (e.g. Ahnentafel) in a PDF file if requested by the project.

    • Current preference given to paternal line ancestry from the West Cork districts (Castletown, Bantry, Skull, Skibbereen, Dunmanway, Clonakilty).

    • Surname is from part 2 Hereditary Proprietors of the Corca Laidhe as listed on our BACKGROUND page; will consider Coffey and its variants; other project surnames considered on case by case basis.

    • One Big Y funding per surname per sale; first who qualifies and first who asks will likely receive the funding; multiple requests for same surname will be wait-listed but are not necessarily disqualified for a future opportunity.

    • Ancestry must be of the typical 19th century County Cork resident: Irish; Roman Catholic; lower classes or lower middle classes, (e.g., tenant farmer, fisherman, weaver, smith, labourer/cottier).

    • No Protestant Ascendancy, other non-Catholic or galloglass paternal ancestry; documented conversions upon famine conditions, upon resettlement in the diaspora, etc are considered.

    • At least some of the pertinent RC / civil registration records of ancestry must be findable online at or; substitute documentation such as digitized images from a family bible will be considered.

    • No prior SNP testing; first time purchase of Big Y only.

    • No prior sponsorship / assisted funding for any Y testing.

    • Minimum one year membership in the project.

    • Proven history of participation in the project as evidenced by questions asked on Activity Feed etc.

    • Meets all other project requirements.

    • If you otherwise meet all requirements but the project runs out of funds during a particular sale, you will be given top priority at the next sale.

    • The project welcomes any and all donations to Corca Laidhe research. Even amounts as small as $5 USD can go towards Big Y tests. Please state your name provide an email in the NOTE field if you donate, so the project administrators can thank you!

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