This project is open to anyone to anyone who feels they are descendant of the Dumnonii, Damnonii, Fir Domhann, or descendant tribal confederations like the Laigin, the Deisi or the Connachta, and all their collective descendants. Mostly people will be in the R-L21 and some subgroups below it, especially R-M222. We're interested in determining regional variation and/or clustering in Ireland and Britain, for these people.