Mary Stewart, Viscountess Mountjoy (1654–1720), formerly the Honourable Mary Coote, was the wife of William Stewart, 1st Viscount Mountjoy. She was the daughter of Richard Coote, 1st Baron Coote (1620-1683), and his wife, the former Mary St George. Her brother was Richard Coote, 1st Earl of Bellomont.
The viscount and viscountess had six sons and two daughters, including:
- Sir William Stewart, 2nd Viscount Mountjoy (1675âÂÂ1728), who married Anne Boyle, daughter of Murrough Boyle, 1st Viscount Blesington, on 23 November 1696.
- Alexander Stewart, who had one daughter, Anne Stewart, his sole heiress.
- Mary Stewart (c. 1677âÂÂ1765), who first married Archibald Preston (1672âÂÂ1703). After his death, she married Vice Admiral George Forbes, 3rd Earl of Granard (1685âÂÂ1765).
- Catherine Stewart, who married Arthur Davys (d. 1733), an Irish Member of Parliament, representing Carrickfergus in the Irish House of Commons.
- Charles Stewart (1681âÂÂ1741), who became an officer in the Royal Navy and a Member of Parliament
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