The title Lord Forrester was created in the Peerage of Scotland in 1633 for Sir George Forrester, Bt who had already been created a baronet in the Baronetage of Nova Scotia in 1625. The Peerage of Scotland is the division of the British Peerage for those peers created in the Kingdom of Scotland before 1707. Baronetage of England (1611-1705 King James I erected the hereditary Order of Baronets in England on 22 May 1611 for the settlement of Ireland When his only son died, Forrester was given a regrant of the peerage in 1651 with special remainders:
Upon George's death three years later, his son-in-law, James (who had changed his surname to Forrester) inherited the title. James' only child by George's daughter had died in 1652 and though he had further issue by his second wife, Lady Jean Ruthven (daughter of the 1st Earl of Brentford), upon his own death in 1679, the title passed to his younger brother, William as stipulated by the second remainder (b). Patrick Ruthven 1st Earl of Brentford and 1st Earl of Forth (c William's son (who also changed his surname to Forrester) inherited the title in 1681 and it continued in the male line until the death of the seventh Lord in 1763, when it passed to the sixth Lord's sister, Caroline. Her only daughter, Anna inherited the title in 1784 and it then passed to Anna's first cousin-once-removed, Viscount Grimston (later Earl of Verulam) in 1808, with which family the title continues to be held by to this day. cousin in Kinship terminology is a relative with whom one shares a common Ancestor, but in modern usage the term is rarely used when referring to a James Walter Grimston 1st Earl of Verulam ( 26 September 1775 – 17 November 1845) styled Lord Dunboyne from 1775 until 1808 and Earl of Verulam is a title in the Peerage of the United Kingdom.