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Son of Olaf Sithricsson, King of Dublin & York and Gormflaith ingen Murchada O'Faelain Father of Ragnall mac Gofraid Brother of Sigtrygg "Silkbeard" Olafsson, King of Dublin & York; Gyda of Dublin; Harald mac Amlaíb of Dublin; Dubgall Olafsson and Aralt Mac Sitriuc Half brother of Glúniairn; Conchobhar mac Mael Sechnaill, King of Tara and Donnchad, King of Munster