A member of the Seymour family headed by the Duke of Somerset, Seymour was the seventh son and youngest child of Francis Seymour-Conway, 1st Marquess of Hertford, and Lady Isabella, daughter of Charles FitzRoy, 2nd Duke of Grafton.
[1] He was returned to the Parliament of Great Britain as one of two representatives for Orford in 1784, a seat he held until 1790.
[3] Seymour married Isabella, daughter of Reverend the Honourable George Hamilton, in 1795.
Their son Sir George Hamilton Seymour was a diplomat.
Seymour died on 10 March 1848, aged 84, and is buried in St. Andrew's Church, Waterloo Street Hove in Sussex[1]