Sitric Cáech, also known as
Sitric Gále, (, died 927) was a
Viking leader who ruled
Dublin and then
Viking Northumbria in the early 10th century. He was a grandson of
Ímar and a member of the
Uí Ímair. Sitric was most probably among those Vikings expelled from
Dublin in 902, whereafter he may have ruled territory in the eastern
Danelaw in
England. In 917, he and his kinsman
Ragnall ua Ímair sailed separate fleets to Ireland where they won several battles against local kings. Sitric successfully recaptured Dublin and established himself as king, while Ragnall returned to England to become
King of Northumbria. In 919, Sitric won a victory at the
Battle of Islandbridge over a coalition of local Irish kings who aimed to expel the Uí Ímair from Ireland. Six Irish kings were killed in the battle, including
Niall Glúndub, overking of the Northern
Uí Néill and
High King of Ireland.