Byzantine emperor (co-emperor)
the time of his birth John VII was Regent of the Byzantine Empire for his uncle Manuel II Palaiologos . At an unknown date, probably after his father settled in Thessalonica , Andronikos V was proclaimed nominal co-emperor, probably by 1403/1404. He predeceased his father, dying probably in 1407.
It should be noted that the imperial status of both John VII and Andronikos V was purely honorary and they were not fully-fledged co-emperors (although John VII had reigned as emperor in 1390 and as regent in Constantinople from 1399 to 1403).