John Thomas Graves was an Irish jurist and mathematician. He was a friend of William Rowan Hamilton, and is credited both with inspiring Hamilton to discover the quaternions in October 1843 and then discovering their generalization the octonions himself later that same year. He was the brother of both the mathematician and bishop Charles Graves and the writer and clergyman Robert Perceval Graves.
- Occupation
- mathematician, university teacher, lawyer, local government officer
- Citizenship
- Ireland, United Kingdom of Great Britain and Ireland
- Born
- December 4, 1806
- Died
- March 29, 1870