 After Ímar 's death , Diarmait appears to have appointed his own son , Murchad ( died 1070 ) , control of Dublin later that decade , as the Annals of the Four Masters <unk> him the title <unk> Gall , meaning " lord of the foreigners " in 1059 . In <unk> , Murchad invaded Mann and seems to have overthrown Echmarcach . Both father and son were dead by 1072 , and the Annals of Tigernach describes Diarmait on his death that year as King of the Isles ( <unk> <unk> Gall , literally " king of the <unk> of the foreigners " ) , a declaration which seems to indicate that , by the eleventh century at least , the kingship of the Isles was contingent upon control of Mann . 
