The title of Earl of Cornwall was created several times in the Peerage of England before 1337, when it was superseded by the title Duke of Cornwall, which became attached to heirs-apparent to the throne.
Contents
Cadoc of Cornwall
Earls of Cornwall, 1st creation (1068)
Earls of Cornwall, 2nd creation (c. 1072)
Earls of Cornwall, 1st creation (revived 1140)
Earls of Cornwall, 3rd creation (1141)
Earls of Cornwall, 4th creation (1225)
Earls of Cornwall, 5th creation (1307)
Earls of Cornwall, 6th creation (1330)
References
Earl of Cornwall Wikipedia(Text) CC BY-SA