Question: Who is Domnall Mac Muirecáin's sibling-in-law?
Sentence (from "Domnall mac Muirecáin"): Francis John Byrne suggests that the root of this apparent confusion lay in the fact that the Uí Dúnlainge kings exercised little real authority due to the aggressions of their western neighbour Cerball mac Dúnlainge (died 888), King of Osraige.
Relevant evidence: No