Background
Seafield was the son of Sir James Grant, 8th Baronet, and Jean Duff.
Seafield was the son of Sir James Grant, 8th Baronet, and Jean Duff.
He was elected to the House of Commons for Elginshire in 1790, a seat he held until 1796. In February 1811 he succeeded his father as ninth Baronet of Colquhoun. Seafield was the grandson of Lady Margaret Ogilvy, daughter of the prominent statesman James Ogilvy, 4th Earl of Findlater and 1st Earl of Seafield.
However, he was not in remainder to the earldom of Findlater which title became extinct.
He assumed the additional surname of Ogilvy on succeeding in the earldom. Lord Seafield never married.
He died in October 1840, aged 73, and was buried in the Mausoleum in Duthil Old Parish Church and Churchyard.