His reign was marked by the gradual dissolution of the imperial power through the rebellion of his son Andronicus IV and by the encroachments of the Ottomans, to whom in 1381 John acknowledged himself tributary, after a vain attempt to secure the help of the popes by submitting to the supremacy of the Roman Church.
John VI Cantacuzenus (co-emperor)
Andronicus IV (1376)
John VII (1390)
Manuel II (1391)