Olaf Guthfrithsson, King of York

https://en.wikipedia.org/wiki/Olaf_Guthfrithson

Olaf Guthfrithsson (Old Norse: Óláfr Guðfriðarson; Old English: Ánláf; rendered in Old Irish writings as Amlaíb mac Gofraid)[1] (died 941) was a member of the Norse-Gael Uí Ímair dynasty and King of Dublin from 934 to 941. He succeeded his father, Gofraid ua Ímair, who was also briefly king of York in 927 following the death of his kinsman Sitric Cáech, but was expelled in the same year by king Æthelstan of England.

http://fmg.ac/Projects/MedLands/IRELAND.htm#_Toc389126206
(also http://fmg.ac/Projects/MedLands/ENGLAND,%20AngloSaxon%20&%20Danish%...)

The name of Guthfrith's wife is not known. Guthfrith & his wife had four children:
a) OLAF Guthfrithson (-end 940). Adam of Bremen names "Analaph, Sigtrih et Reginold" as sons of Gudred, ruling in England[1219], although this is of uncertain accuracy as the undated paragraph is anachronistic as it follows that recording the succession of Emperor Otto III in 983. The Annals of the Four Masters record that “Amhlaeibh son of Godfrey” plundered “the province of Ulster” in 931 but defeated by “Muircheartach son of Niall”[1220]. He succeeded his father 934 as King of Dublin. The Annals of Ulster record that "Amlaíb grandson of Imar” sacked “the island of Loch Gabor” in 935[1221]. In 937, he sailed with a large fleet for England to reconquer York, joining forces with his father-in-law Constantine King of the Scots and Owen King of Strathclyde, but was defeated by Æthelstan King of Wessex at Brunanburh, and returned to Ireland[1222]. Simeon of Durham records that "Anlaf the pagan king of the Irishmen…stirred up by his father-in-law Constantine king of the Scots" and entered the mouth of the Humber river in 937[1223]. The Annals of Ulster record that "Amlaíb son of Gothfrith” was “in Ath Cliath again” in 938[1224]. He invaded England in 939 and by the end of that year had occupied York, installing himself as King of York. Simeon of Durham records that "King Onlaf first came to York" in 939[1225]. In raids on northern Mercia the following year, he took Tamworth and nearby land, and by treaty with Edmund took the whole of modern Leicestershire, Derbyshire, Nottinghamshire and Lincolnshire. He continued by invading Northumbria over the Tees before he died. The Chronicon Scottorum records the death in 941 of "Amlaib son of Gothfrith, king of the fair foreigners and the dark foreigners"[1226]. The Annals of Clonmacnoise record in 934 the death of "Awley m´Godfrey king of the Danes"[1227]. Edmund regained the lost territories from his successor Olaf Sitrihcson in 942.
m (937) --- of the Scots, daughter of CONSTANTINE II King of the Scots & his wife --- . King Constantine was Olaf's father-in-law according to Florence of Worcester[1228].
Olaf [& his wife] had two children:

1. SIHTRIC "Caman" (-after 960). The Annals of Ulster record that "Camán son of Amlaíb son of Gothfrith was defeated at Dub” in 960[1229]. The Annals of the Four Masters record in 960 “a prey by Sitric Cam from the sea to Ui-Colgain, but he was overtaken by Amhlaeibh, with the foreigners of Ath-cliath and the Leinstermen”[1230].
2. GUTHFRITH (-963). The Annals of Ulster record the death in 963 of "Guthfrith son of Amlaíb”[1231].