Blácaire mac Gofraid
Blácaire mac Gofraid (died 948) was a Viking leader who ruled Dublin in the 10th century.
He succeeded his brother Amlaíb mac Gofraid as king in 939 after the latter left Dublin to rule Northumbria.
In the early years of his reign Blácaire led raids on important Christian sites at Clonmacnoise and Armagh, but repeated attacks by the Irish of Leinster in 943 and 944 led to the sack of Dublin.
A year later Blácaire was replaced as King of Dublin (perhaps because of his inability to defend the city) by his cousin Amlaíb Cuarán, who had succeeded Blácaire's brother in Northumbria in 941, but had been driven out in 944.
Amlaíb allied with Congalach Cnogba, overking of Brega and the Southern Uí Néill, one of those Irish kings who led the attack on Dublin in 944, and was possibly subject to him.
They fought together against the Northern Uí Néill in 947, but they were defeated and the Dubliners suffered many casualties.
That year Blácaire was able to regain the kingship from Amlaíb and reversed the alliance with Congalach.
Vikings raided into Congalach's lands in 948, leading to a battle between the Dubliners and the Southern Uí Néill in which Blácaire was killed.
With his rival dead, Amlaíb left for England to regain Northumbria and his brother Gofraid mac Sitriuc was made king in Dublin.
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Olaf Guthfrithson
Olaf Guthfrithson (died 941) was a Viking leader who ruled Dublin and Viking Northumbria in the 10th century.
He was the son of Gofraid ua Ímair and great-grandson of Ímar, making him one of the Uí Ímair.
Olaf succeeded his father as King of Dublin in 934 and succeeded in establishing dominance over the Vikings of Limerick when he captured their king, Amlaíb Cenncairech, in 937.
That same year he allied with Constantine II of Scotland in an attempt to reclaim the Kingdom of Northumbria which his father had ruled briefly in 927.
The forces of Olaf and Constantine were defeated by the English led by Æthelstan at the Battle of Brunanburh in 937.
Olaf returned to Ireland in 938 but after Æthelstan's death the following year Olaf left for York where he was quickly able to establish himself as king, with his brother Blácaire mac Gofraid being left to rule in Dublin.
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This agreement proved short-lived, however, and within a few years Vikings had occupied the Five Boroughs of Derby, Leicester, Lincoln, Nottingham and Stamford.
Olaf died in 941 and was succeeded in Northumbria by his cousin Olaf Cuaran.
At the time of his death, the Irish annals title him "king of Danes" and "king of the Fair Foreigners and the Dark Foreigners".
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Question: Who is Blácaire Mac Gofraid's father?
Answer: Gofraid ua Ímair