William Grimston, 1st Viscount Grimston

William Grimston, 1st Viscount Grimston (31 December 1684 – 15 October 1756) was a British peer and Member of Parliament.

Born William Luckyn, Grimston was the younger son of Sir William Luckyn, 3rd Baronet, and Mary Sherrington. In 1700 he succeeded to the estates of his great-uncle Sir Samuel Grimston, 3rd Baronet, of Bradfield, and assumed the surname of Grimston in lieu of Luckyn. He was elected to the House of Commons for St Albans in 1710, a seat he held until 1722 and again from 1727 to 1734. In 1719 he was raised to the Peerage of Ireland as Baron Dunboyne and Viscount Grimston. As these were Irish peerages they did not prohibit Grimston from sitting in the British House of Commons. In 1738 he also succeeded his elder brother as fifth Baronet.

Lord Grimston married Jean Cooke, daughter of James Cooke, in 1706. He died in October 1756, aged 72, and was succeeded in his titles by his son James. Lady Grimston died in 1765.

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