Grimston was the son of James Grimston, 3rd Viscount Grimston, and Harriot Walter. In 1802 Grimston was elected to the House of Commons for Street Albans, a seat he held until 1808, when he succeeded his father as fourth Viscount Grimston and second Baron Verulam and entered the House of Lords.
Christ Church.
In 1815 Verulam was created Viscount Grimston and Earl of Verulam in the Peerage of the United Kingdom. He later held the honorary post of Lord Lieutenant of Hertfordshire from 1823 to 1845. Lord Verulam married Lady Charlotte Jenkinson, daughter of Charles Jenkinson, 1st Earl of Liverpool, in 1807.
James Walter Grimston, 2nd Earl of Verulam (1809–1895)
Lady Katherine Grimston (1810–1874), married in 1834 John Foster-Barham (d 1838), married in 1839 George Villiers, 4th Earl of Clarendon
Honorary
Edward Harbottle Grimston (1812–1881)
Honorary Henry Luckyn Grimston (d 1814, young)
Lady Emily Mary Grimston (1815–1901), married William Craven, 2nd Earl of Craven
Honorary
Robert Grimston (1816–1884)
Captain Honorary Charles Grimston (1818–1857), Coldstream Guards
Lady Mary Augusta Frederica Grimston (1820–1879), married Jacob Pleydell-Bouverie, 4th Earl of Radnor
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Honorary Francis Sylvester Grimston (1822–1865), married Katherine Morier and had issue
Lady Jane Frederica Harriet Mary Grimston (1825–1888), married James Alexander, 3rd Earl of Caledon
Lady Verulam died in 1863.
2nd United Kingdom Parliament. 3rd United Kingdom Parliament. 4th United Kingdom Parliament.
