He was the third son of John Hanbury of Pontypool, an ironmaster, and his second wife Bridget Ayscough, daughter of Sir Edward Ayscough; and brother of Charles Hanbury Williams.
[4] In politics the Hanburys were Whigs, and allies of the Monmouthshire Morgan family.
[5] Capel Hanbury at the end of his life was a Rockingham Whig.
[6] He first became a Member of Parliament for Leominster in 1741, on the basis of a connection with Lady Coningsby.
They had one son, John Hanbury, and two daughters Henrietta and Frances who died unmarried.