Sitric Cáech or Sihtric Cáoch (or in Norse Sigtryggr) (died 927) was a Norse King of Dublin who later reigned as King of York. His epithet 'caoch' means 'One-eyed'. He was a grandson of Ímar. In 888 he killed his brother Sicfrith. He belonged to the House of Ivar.
The Annals of Ulster record the arrival of two viking fleets in Ireland in 917, one led by Ragnall and the other by Sitric, both of the House of Ivar. They fought a battle against Niall Glúndub in which the Irish were routed, and according to the annals Sitric then 'entered Áth Cliath', i.e. Dublin, which we must assume means that he took possession of it. Ragnall ua Ímair, after occupying Waterford, went on to Scotland, and then conquered York and became king there.
Sitric fought several battles with Niall Glundub. Warfare is recorded in 918, and in 919 Niall and several other Irish petty kings were killed in a major battle at Dublin. This was probably the most devastating defeat ever inflicted on the Irish by the Norse, and Sitric's possession of Dublin seemed secure. Sitric however left Dublin already in 920 or 921, the pious annalist claims he left 'through the power of God'. The truth of it was that Sitric had ambititions elsewhere, and following Ragnall's death he became king of York. His kinsman Guthfrith ruled in Dublin.
Sitric attacked Mercia from the Mersey which formed part of the border between Mercia and the Viking Kingdom of York. He also commanded Viking forces in the Battle of Confey and other battles.
In 926 he married King Athelstan of England's sister (possibly St Editha) in a political move designed by Athelstan to build up his influence in the north of England. Sitric died suddenly only a year later in 927 and Athelstan assumed his throne.
Sitric's son, Amlaíb Cuarán, aka Óláf Sigtryggsson later succeeded him both as king of Dublin and of York and married the infamous Gormflaith, who was later married to Brian Boru, High King of Ireland.
His son Guthfrith Sitricesson ruled Dublin. (A third son Harald ruled Limerick and died in 940.)
