Template:Wp-Flann Sinna

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Flann Sinna (lit. Flann of the Shannon; Irish: Flann na Sionainne; 84725 May 916), also known as Flann mac Máel Sechnaill, was the son of Máel Sechnaill mac Máele Ruanaid of Clann Cholmáin, a branch of the Southern Uí Néill. He was King of Mide from 877 onwards and a High King of Ireland. His mother Land ingen Dúngaile was a sister of Cerball mac Dúnlainge, King of Osraige.

Flann was chosen as the High King of Ireland, also known as King of Tara, following the death of his first cousin and stepfather Áed Findliath on 20 November 879. Flann's reign followed the usual pattern of Irish High Kings, beginning by levying hostages and tribute from Leinster and then to wars with Munster, Ulster and Connacht. Flann was more successful than most kings of Ireland. However, rather than the military and diplomatic successes of his reign, it is his propaganda statements, in the form of monumental high crosses naming him and his father as kings of Ireland, that are exceptional.

Flann may have had the intention of abandoning the traditional succession to the kingship of Tara, whereby the northern and southern branches of the Uí Néill held the kingship alternately, but such plans were thwarted when his favoured son Óengus was killed by his son-in-law and eventual successor Niall Glúndub, son of Áed Findliath, on 7 February 915. Flann's other sons revolted and his authority collapsed.