John V Palaiologos
Demetrios I Kantakouzenos (; 1343 – 1384) was a governor of the Morea and the grandson of Emperor John VI Kantakouzenos. Demetrios was the son of Matthew Kantakouzenos, governor of Morea, and Irene Palaiologina. Demetrios was given the title of "sebastokrator" by Emperor John V Palaiologos in December 1357 and went to the Peloponnese with his father and grandfather in 1361.