Background
Stewart was the son of William Stewart, 2nd Viscount Mountjoy and Anne Boyle.
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William Stewart
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Career
He succeeded his father as Viscount Mountjoy on 10 January 1727. He was Grand Master of the Freemasons (in Ireland) between 1738 and 1740. He was created Earl of Blessington on 7 December 1745, his mother having been sister and sole heiress of Charles, 2nd and last Viscount Blesington.
He was made Governor of County Tyrone and in 1748, was sworn of the Privy Council of Ireland.
On his death in London on 14 August 1769 he was buried at Silchester in Hampshire.
