The Taunus lineage project's core joins men who share closely matching 111 marker Y-DNA results including rare allele values. These matches indicate a virtual certainty that they have a common paternal ancestor who probably lived during the First Millennium CE. The name of the group, Taunus, is derived from the Taunus Mountains where its earliest known ancestors lived in the late 14th Century in the town of Eppstein. The Taunus project is characterized by the modal haplotype that is shown in its web page and membership in the R-L408 haplogroup. The Taunus project is open to FTDNA customers whose Y-DNA STR results show a match with its modal haplotype or with any man whose terminal SNP is R-BY13147 (L408's parent) or downstream of it.