[2][1] He became king after Ecgberht I was overthrown and fled, with Wulfhere, Archbishop of York, to Mercia.
[4][5] After the death of Ecgberht in 873, Ricsige became King of Northumbria, and restored Wulfhere as Archbishop of York.
[5] The Anglo-Saxon Chronicle reports that the Great Heathen Army came north against the Northumbrians in 873.
[6] Halfdan Ragnarsson departed Repton in 875, bringing Northumbria under his dominion and destroying all of the monasteries.
[8] In 2020, Ricsige was featured in Ubisoft's Assassin's Creed: Valhalla, installed as the King of Northumbria by Halfdan Ragnarsson after Ecgberht's deposition.