Flann Sinna

Flann Sinna (847 – 25 May 916), son of Máel Sechnaill I of Clann Cholmáin, was king of Mide from 877 and high king from 879. He took hostages from Leinster, attacked Armagh with Irish and Norse allies in 882, and lost to the Vikings at the Battle of the Pilgrim in 887.

In 908 he routed the Munstermen at Bellaghmoon and killed King Cormac mac Cuilennáin. High crosses at Clonmacnoise named him king of Ireland. After his heir Óengus was killed in 915 and his sons revolted, Flann died on 25 May 916 near Mullingar; Niall Glúndub succeeded him.