Annalistic reference

• 1126. Domhnall Finn Ua Dubhda, lord of Ui-Amhalghadha, was drowned, after he had plundered Tir-Conaill. The Annals of Tigernach
  Annals of Tigernach
  The Annals of Tigernach is a chronicle probably originating in Clonmacnoise, Ireland. The language is a mixture of Latin and Old and Middle Irish....
  
  have a more fulsome account, stating Domhnall the Fair Ó Dubhda, king of Uí Amalgaidh, Uí Fiachrach and Cera, a man who never gave a refusal to anyone, was drowned in driving a prey out of Tyrconnell.