Earl of Thomond

In consequence, all reigning monarchs and clan chiefs in Ireland were ordered to surrender their native titles in return for peerages.

This surrender and regrant offer was conditional upon the adoption of Tudor customs and laws, including pledging allegiance to the Irish Crown and apostatising from the Catholic faith by accepting the articles of the state established Church of Ireland.

The titles of Ibrickane and Thomond merged on the first Earl's death in 1551, and the barony of Inchiquin went to his eldest son.

However, when he died in 1741, the next heir would have been a descendant of Daniel O'Brien, 3rd Viscount Clare who was attainded in 1691, so the three titles became forfeit.

However, Charles O'Brien, 6th Viscount Clare, a Jacobite exile used the title Earl of Thomond, as did his son, who died childless in 1774.