John IV Megas Komnenos was Emperor of Trebizond from 1429 until his death. He was a son of Emperor Alexios IV of Trebizond and Theodora Kantakouzene.
- Occupation
- sovereign
- Position held
- despot, emperor of Trebizond
- Citizenship
- Empire of Trebizond, Byzantine Empire
- Born
- 1404
- Died
- April 1460