Theobald Dillon, 7th Viscount Dillon of Costello-Gallin supported King James II, was attainted on 11 May 1691, and fell in the Battle of Aughrim during the Williamite War. His attainder was reversed in favour of the 8th Viscount on 20 June 1694.

Henry Dillon, 8th Viscount Dillon was an Irish soldier and politician. In 1689 he sat in the Patriot Parliament. He fought for the Jacobites during the Wiiliamite War, defending Galway against Ginkel and surrendering it in 1691 after a short siege. He obtained the reversal of his father's attainder in 1696 recovering his father's lands.