Isabella Anne Seymour-Conway, Marchioness of Hertford was an English landowner and courtier and a mistress of King George IV when he was Prince of Wales. She was born at Temple Newsam in Leeds, and was the eldest daughter of Charles Ingram, 9th Viscount of Irvine, and his wife Frances Gibson Shepheard Ingram. She married Francis Ingram-Seymour-Conway, 2nd Marquess of Hertford, in 1776, at age sixteen, being his second wife. She was known as Lady Beauchamp until 1794 when her husband succeeded his father.