William Ó Con Ceanainn

William Ó Con Ceanainn, Lord of Uí Díarmata, died in 1478.

Sub anno 1478, the Annals of the Four Masters state that "Thomas O'Concannon, Lord of Hy-Diarmada, was slain by the son of his own brother."

He was succeeded by William, who died later the same year, who was in turn succeeded by his son, Davock.

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