How the discovery of the Y-STR signature, “A Set of Distinctive Marker Values Defines a Y-STR Signature for Gaelic Dalcassian Families “, Dennis M Wright, JoGG Vol 5 Number 1 (Spring 2009) (a), led to the discovery of the R-L226 DNA Haplogroup, which lead to the discovery of a Haplogroup for a King and his descendants.

This paper builds on the discovery of this Y-DNA signature to establish that the SNP R-DC782, which dates from 900CE and is 7 splits after R-L226, the known Dalcassian Clan SNP, dated from 250CE (g), belongs to those who are descendants of King Brian Bóramha, AKA known as Brian Boru.

Thus, supporting a paper trail history over 32 generations in the Inchiquin Line leading to the current Leader of the Clan, Sir Conor Myles John O’Brien, 18th Baron of Inchiquin, as well as finding the missing descendant line from the senior royal line through Daniel O’Bryan, 1st Viscount Clare (c1577-c1663) (c).

As will be discussed later, there is evidence that those who carry this DC782 SNP are primarily of the surname O’Brien, while some have changed names because of political, religious reasons, adoptions, or because of a Non-Paternal-Event (NPE), with most having a known historical connection to the old Provinces of Munster and Thomond.

There are 94 people who have been tested through FamilyTree DNA (b) and carry the SNP R-DC782, 74 are members of the O’Brien Surname Project and carry a surname associated with O’Brien. There are 4 with the surname O’Dea, who presumed to be of the O’Brien line from associations and family swapping in the 14-15th Centuries.

That only leaves 12 other males of various surnames with no connections to the O’Brien’s that can be confirmed at this time.

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