Tál Cas

Cas or Tál Cas was the eponymous ancestor and dynastic founder of the Dál gCais[1] (Deisi Tuaiscirt) clan in Gaelic Ireland, from whom all branches of the Dalcassian dynasty claim common descent.

Tál Cas was the son of Conall Eachluath and his wife Coirpthe, daughter of Eochaid Mugmedon.

[2] He acquired the nickname Tál (meaning "adze") as he was the foster son of a wright.

On his death the kingship of Thomond passed to his eldest son Blait.

[3][4] He had thirteen sons, at least three of whom would found substantial lineages whose descendants would rule as lords over substantial territories: Surnames purported to be of Dalcassian origin have a statistically significant correlation with the possession of the Y-DNA signature R-L226 and thus this mutation is believed to be associated with their ancestral founder.