Sir Maurice Eustace, 1st Baronet (died 15 October 1693[1]) was an Irish gentleman, the only holder of the Eustace Baronetcy of Castle Martin in County Kildare, which was created for him in the Baronetage of Ireland on 23 December 1685.
[1][2] 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] 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.
[4] In the Williamite War in Ireland, the baronet was colonel of an infantry regiment in James II's army.