Earl of Monmouth was a title that was created twice in the Peerage of England.
He had already been created Baron Carey, of Leppington, in 1622, also in the Peerage of England.
The titles became extinct upon the death of his son, the second Earl, who died without surviving male issue in 1661.
In 1697 he succeeded his uncle as Earl of Peterborough.
In 1701, Charles Middleton, previously 2nd Earl of Middleton was awarded the Jacobite peerages of Earl of Monmouth and Viscount Clermont in the Peerage of England.