Olaf III Guthfrithson (died 941) ruled as Norse king of Dublin from 934 to 941. Guthfrith, his father, held both Dublin and York until Athelstan of England expelled him from York in 927.
After Athelstan's death in 939, Olaf again invaded York the same year, forcing Athelstan's successor, Edmund, into a treaty which ceded to Olaf Northumbria and part of Mercia. He did not get to enjoy his new lands for long, dying just two years later in 941. He was succeeded by Olaf Cuaran.
Athelstan died in 939 and OlafGuthfrithson, king of Dublin at the time, invaded Northumbria and compelled Edmund, Athelstan's successor, to surrender Deira.
When OlafGuthfrithson died in 942, Olaf Cuaran succeeded him, finally recovering the throne of his father in addition to the throne of Dublin.
Olaf managed to regain his lands in Northumbria in 949, only to be expelled again in 952, this time by Erik Bloodaxe[?].
Athelstan died in 939 and OlafGuthfrithson, king of Dublin at the time, invaded Northumbria and compelled Edmund, Athelstan's successor, to surrender Deira.
When OlafGuthfrithson died in 942, Olaf Cuaran succeeded him, finally recovering the throne of his father in addition to the throne of Dublin.
Olaf managed to regain his lands in Northumbria in 949, only to be expelled again in 952, this time by Erik Bloodaxe.