Déisi Tuisceart Byrne later discusses how the rise of the Dál gCais sept of Déisi Tuisceart in North Munster at the expense of the Eóganachta was not unlike the rise of that dynasty at the expense of the Dáirine several centuries before, and this may in fact have been the inspiration for Dál gCais claims. An earlier and frequently cited argument by John V. Kelleher is that this was a political scheme of the Uí Néill, Ireland's most dominant dynasty, whom he argues created the Kingdom of Thomond in the tenth century to further weaken the position of the already divided Eóganachta. If true, the Uí Néill were creating who would soon become their greatest military rivals in nearly the last four centuries, threatening Tara as much as Cashel. The Déisi Muman, on the other hand, remained prominent supporters of the Eóganachta throughout their career. The movement of the Déisi Tuisceart into the modern County Clare is not documented, but it is commonly associated with the "annex" of the region to Munster after the decline of Uí Fiachrach Aidhne power in south Connacht. Byrne suggests this dates from the victory of the king of Cashel, Faílbe Flann mac Áedo Duib, over the celebrated king of Connacht Guaire Aidne mac Colmáin at the Battle of Carn Feradaig in 627. A famous early 12th-century propaganda text detailing the rise of the Dál gCais is the Cogad Gáedel re Gallaib. Recent studies suggest the Dál gCais have a genetic signature unique to themselves, referred to as Irish Type III. Belonging to Haplogroup R1b (Y-DNA), this subclade R1b1b2a1a1b4h is defined by the presence of the marker R-L226/S168. Annalistic references AI966.1 Bissextile. Kl. Death of Cellach son of Faelán, king of Laigin, and of Faelán son of Cormac, king of the Déisi. AI982.3 Cathal son of Gébennach, a royal heir of In Déis Bec, and Uainide son of Donnubán, king of Uí Chairpri, and Donnchadh son of Mael Sechnaill, king of Gabair, and many others died this year. AI985.2 The Déisi raided Brian's mercenaries and took three hundred cows. And Brian harried the Déisi to avenge that, and chased Domnall, son of Faelán, as far as Port Láirge, and the whole of the Déisi was devastated. AI1009.2 Death of Aed, king of the Déisi. AI1031.5 A battle between the Déisi, and great slaughter was inflicted on both sides. See also Bruff Declán of Ardmore Gaeltacht