Sir Cahir O'Doherty (1587–1608) was the last Gaelic Lord of Inishowen.  Following the Flight of the Earls in 1607, he rebelled against English domination in Ireland and the plantation of Protestant settlers in what is known as O'Doherty's Rebellion. Provoked by the English Governor George Paulet, Cahir and his followers attacked and destroyed Derry and burned several castles in Strabane and Lifford in 1608. However, the King's Marshal Richard Wingfield (1st Viscount Powerscourt) recovered the city in a counter-attack and on 5 July 1608, Sir Cahir was killed at the Rock of Doon during the Battle of Kilmacrennan on 5 July 1608. The remaining rebels were then crushed by Sir Arthur Chichester who received the Lordship of Inishowen for himself, together with a grant of O’Doherty's entire 170,000 acres of land in Inishowen.