Mary married 2nd Earl Chatham, John Pitt on 09 Jul 1783. John (son of 1st Earl Chatham, William Pitt and Lady Chatham Hester Grenville) was born on 10 Sep 1756 in Hayes, Near Bromley, Kent; was christened on 07 Nov 1756 in Hayes, Kent; died on 24 Sep 1835 in 10 Charles Street, Berkeley Square; was buried on 03 Oct 1835 in Pitt Family Vault, North Transept, Westminster Abbey. [Group Sheet] [Family Chart]