Flann Sinna


Flann Sinna (r. 879-916 CE) was a High King of Ireland from the Kingdom of Mide (Meath) and a member of the Clann Cholmain, a branch of the Southern Ui Neill dynasty. His name is pronounced “Flahn Shinna” and means “Flann of the Shannon”. He is best known as an effective high king of Ireland who consolidated the power of the Kingdom of Meath while honoring his obligations to other kingdoms, famous for his victory at the Battle of Ballaghmoon in 908 CE, and erecting monuments to commemorate his achievements; most notably the Cross of the Scriptures at the Abbey of Clonmacnoise.

More about: Flann Sinna


  • c. 848 - 916
    Life of Flann Sinna.
  • 879 - 916
    Reign of Flann Sinna, High King of Ireland.
  • c. 887
    Flann Sinna defeated by Sichfrith son of Imair of Dublin at the Battle of the Pilgrim.
  • 901
    Flann Sinna's son Donnchad Donn rebels; Flann slaughters his associates at Kells.
  • 908
    Flann Sinna defeats the armies of Munster at the Battle of Ballaghmoon.
  • 910
    Kingdom of Breifne rebels; Flann Sinna crushes the revolt.
  • 913
    Kingdom of Brega rebels; Flann Sinna crushes the revolt, destroys churches and monasteries in the region of Brega.
  • 915
    Flann Sinna's sons Donnchad Donn and Conchobar rebel; are defeated by Flann's vassal Niall Glundub.
  • 916
    Flann Sinna dies; is succeeded by Niall Glundub as High King of Ireland.