Another figure who may have held power in Galloway at about the time of Suibne's "floruit" was a particular son of Sitriuc mac Amlaíb, King of Dublin. According to the thirteenth-century "Historia Gruffud vab Kenan", a son of Sitriuc named Amlaíb was the grandfather of Gruffudd ap Cynan, King of Gwynedd. If this source is to be believed, Amlaíb held royal power in the Rhinns and the territory of the "Gall Gaidheil" (amongst other places). The text makes a clear distinction between the Rhinns and the lands of the "Gall Gaidheil", treating them as separate territories. This suggests that the region encompassed within present-day Wigtownshire was regarded as distinct from the territory of the "Gall Gaidheil" in the eleventh century. The account may also be evidence that Amlaíb was a contemporary of Echmarcach and Suibne, and could indicate that he held power in Galloway and the Isles at some point between 1028 (the year his father set out upon a pilgrimage) and 1034 (a possible year of his death).