Donnell Ballagh O'Cahan

Donnell Ballagh O'Cahan (died c. 1617) was an Irish landowner in Ulster. A vassal of Hugh O'Neill, Earl of Tyrone, O'Cahan was frequently in rebellion alongside his lord in the closing years of the 16th century. Although he did not go into exile with Tyrone, he claimed to have been betrayed by the English Crown, which he accused of failing to keep to an agreement over a large grant of lands. Arrested for treason, he was never brought to trial but was held captive in the Tower of London until his death sometime around 1617.