Blacair Guthfrithsson, King of Dublin

https://en.wikipedia.org/wiki/Bl%C3%A1caire_mac_Gofrith

Blácaire mac Gofrith (died 948), in Old Norse Blákári Guðrøðsson, was King of Dublin. Son of Gofraid ua Ímair, he was a great-grandson of Ímar, ancestor of the Uí Ímair kindred which dominated the Scandinavianised and Norse-Gael regions of the British Isles in the tenth century.

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http://fmg.ac/Projects/MedLands/IRELAND.htm#_Toc389126206

Guthfrith & his wife had four children:

c) BLACAIR (-killed in battle 948). King of Dublin: the Annals of the Four Masters record in 938 that “Blacaire son of Godfrey came to Ath-cliath”[1234]. The Annals of the Four Masters record the death 26 Mar 941 of “Muirchertach of the Leather Cloaks, son of Niall Glundubh, lord of Aileach…slain at Ath-Fhirdiath” by “Blacaire son of Godfrey lord of the foreigners”[1235]. The Annals of the Four Masters record that “Blacaire one of the chiefs of the foreigners was expelled from Dublin” in 943 and “Amhlaeibh remained after him there”[1236]. The Annals of Ulster record that "Blacair gave up Áth Cliath” in 945 and that “Amlaíb succeeded him”[1237]. The Annals of Ulster record that "Blacair son of Gothfrith king of the foreigners” was killed in 948 by “Congalach son of Mael Mithig”[1238].