Echmarcach's meeting with Knútr included two other kings: Máel Coluim and the Moravian ruler, Mac Bethad mac Findlaích. Although Máel Coluim and Mac Bethad appear to have been related, the nature of the relationship between Máel Coluim and Echmarcach is uncertain. If Suibne was indeed a brother of the Scottish king, and ruled in Galloway at his behest, it could be evidence that Echmarcach was another client-king of Máel Coluim. In fact, the agreement with Knútr could indicate that Máel Coluim enjoyed overlordship over Mac Bethad and Echmarcach. If so, and if Máel Coluim indeed held power in the southern Hebrides as the "Prophecy of Berchán" seems to suggest, Echmarcach's realm may have encompassed Mann, the Rhinns, and only the Hebridean islands north of the Ardnamurchan peninsula. If Suibne and Máel Coluim were indeed brothers, and the former owed his authority amongst the "Gall Gaidheil" to the power of the Scottish Crown, it is even possible that the Scots expelled Echmarcach from the Isles at some point between the concord with Knútr and Suibne's death as king.