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L1402 - Seven Septs of Laois, Dál nAraidi, Laigin, Fir Domnann, or just a wide distribution of people?

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L1402 is a phylogenetic child of L1403, and, subsequently, the phylogenetic parent of A818[1], which was previously believed to be the the root haplogroup of the Seven Septs of Laois - O'Moore, O'Devoy/O'Deevy, O'Doran, O'Dowling, McEvoy, O'Kelly, and O'Lalor, of County Laois (projected to around 1028 B.C.). The Seven Septs of Laois (also known as the Loigis Tribe) claim descent from Lugaid Laigsech, of the Dál nAraidi of Northern Ireland. Legend has it that this offshoot tribe of Dál nAraidi was rewarded territory (the present County Laois) from the king of Leinster, for contributing "troops" to expel a Munster occupation of western Leinster. This is said to have taken place around the 3rd century, A.D.

Yet, given the connection to Leinster, and the dispersion of places connected to ancestors of Y DNA test-takers, the Dál nAraidi theory, like the Seven Septs of Laois theory, is worth scrutinizing. If it is connected to the Fir Domnann (sometimes cited as a tribe of Firbolgsa) of the Laigin (who were said to have invaded Leinster sometime before the 4th century, and, also were said to have come from western Caernarvonshire, south of Anglesey, in Wales), then the distribution of Y tested persons may end up challenging this theory as well. Given the haplogroup stream of A818<L1402<L1403<ZZ32, it appears ZZ32 is likely a common ancestor in the Dumnonii (though this was a name used by Ptolemy to describe this group of people) of Cornwall, Devon, etc. As opposed to the Seven Septs of Laois, who are said to claim descent from Lugaid Laigsech, Laigin are said to claim descent from Labraid Loingsech. Yet, both names are strikingly similar, suggesting the possibility that the two might be one in the same.

Further study is required for possible disambiguation in the Seven Septs of Laois/Laigin origins. This may also boil down to the difference under DF13, distinguishing the differences between two bands of people who fell under DF21 and FGC11134 (which, according to Williamson's age analysis, would have emerged before 1658 BC and 1226 BC, respectively). Under DF21, and following the haplogroup stream to L1403 and L1402, there is what is believed to be the Seven Septs of Laois, but, following FGC11134 (which falls under CTS4466/Irish Type II), to A2289, there is evidence of a set of surnames that is mirroring that of L1402. This group under A2289, however, is clearly traceable to Laois, Offaly, Tipperary, and Kerry, whereby the branch from L1402 appears to show more roots in Ulster. More to follow.


Haplogroup L1402 Age Estimation

  • Using the aging method developed by Iain McDonald, the median age of this block is 1660.96 YBP (289 AD). The 95% confidence interval is 154 BC to 631 AD. Note that YBP = "Years Before Present".

Phylogenetic Child of L1402


Phylogenetic Parent of L1402



  1. Using the aging method developed by Iain McDonald, the median age of A818 is 1598.41 YBP (352 AD). The 95% confidence interval is 8 BC to 648 AD.


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