Domnall mac Taidc

Domnall mac Taidc
King of the Isles; King of Thomond
Domnall's name as it appears on folio 33v of British Library Cotton MS Julius A VII (the Chronicle of Mann): "Dompnaldum filium Tadc".
Died	1115
House	Meic Taidc (Uí Briain)
Father	Tadc mac Toirdelbaig
Mother	Mór ingen Echmarcacha

Domnall mac Taidc (died 1115) was the ruler of the Kingdom of the Isles, the Kingdom of Thomond, and perhaps the Kingdom of Dublin as well. His father was Tadc, son of Toirdelbach Ua Briain, King of Munster, which meant that Domnall was a member of the Meic Taidc, a branch of the Uí Briain. Domnall's mother was Mór, daughter of Echmarcach mac Ragnaill, King of Dublin and the Isles, which may have given Domnall a stake to the kingship of the Isles.

In 1094, Domnall's uncle, Muirchertach Ua Briain, High King of Ireland, drove Gofraid Crobán, King of Dublin and the Isles from Dublin, and may have replaced him with Domnall himself. Certainly at some point following Gofraid's death in 1095, Muirchertach installed Domnall as King of the Isles. The latter's reign was short-lived however, and Domnall appears to have been forced from the Isles prior to its subsequent conquest by the King of Norway.

In 1111, Domnall evidently seized the kingship of the Isles by force. It is uncertain whether he enjoyed Uí Briain support in this venture. Several years later, at a time when his aforesaid uncle was gravely ill, Domnall was again active in Ireland. Although he may have openly left the Isles to take advantage of his uncle's demise, it is also possible he was forced out by the Islesmen. Domnall was slain in 1115, apparently at the hands of Toirdelbach Ua Conchobair, King of Connacht. It is possible that he was survived by two sons.

Domnall was a son of Tadc (died 1086), son of Toirdelbach Ua Briain, King of Munster (died 1086). Domnall was, therefore, a member of the Meic Taidc. According to the twelfth-century Banshenchas, Domnall's father married Mór, daughter of Echmarcach mac Ragnaill, King of Dublin and the Isles (died 1064/1065). This source specifies that the couple had three sons and a daughter: Amlaíb (died 1096), Bé Binn, Donnchad (died 1113), and Domnall himself.