The Earldom of Chatham was a peerage given to William Pitt the Elder in 1766, after which he became Lord Privy Seal. In addition he was also created Viscount Pitt which became the main subsidary title for the peerage. Pitt's wife Hester was earlier created Baroness Chatham in 1761, as at that stage her husband wished to remained a member of the House of Commons. Their eldest son John inherited the Earldom and Viscountcy is 1778 and the Barony in 1803. Upon his death all three titles became extinct.

Barons Chatham (1705)

• John Campbell, 2nd Duke of Argyll, 1st Baron Chatham (1678-1743)

Barons Chatham (1761)

• Hester Pitt, 1st Baroness Chatham (1720-1803)
• John Pitt, 2nd Baron Chatham (1756-1835); had previously succeeded as Earl of Chatham

Earls of Chatham (1766)

• William Pitt, 1st Earl of Chatham (1708-1778)
• John Pitt, 2nd Earl of Chatham (1756-1835)

External link

• Leigh Rayment's Peerage