Sir Maurice Eustace, 1st Baronet

The baronet was the son of John Eustace of Castlemartin, of a branch of the old Anglo-Irish family of FitzEustace whose titles included Viscount Baltinglass and Baron Portlester.[2] John Eustace's father Maurice was elder son of William Eustace, whose younger son John (of Harristown) was the father of Sir Maurice Eustace, Lord Chancellor of Ireland.[2] The Lord Chancellor's brother William was father of a third Sir Maurice Eustace (died 1703), who was MP for Knocktopher (1665–6) and for Harristown (1692–5).[2]

The baronet married Margaret (died 1738),[2] daughter of Brigadier Sir Thomas Newcomen of Sutton, Dublin and his wife Frances, daughter of Sir William Talbot, 1st Baronet.[2][3] His daughters Frances and Maria Henrietta, died unmarried.[2]

In 1686 Sir Maurice was appointed to the Privy Council of Ireland.[4] In the Williamite War in Ireland, the baronet was colonel of an infantry regiment in James II's army.[5] He sat in the Patriot Parliament for the borough of Blessington.[4] After the Jacobite defeat he was attainted in 1691 and the baronetcy was forfeited.[2] Under the Treaty of Limerick he emigrated to France where he died.[6][2]