Answer
Andronikos III Palaiologos was disinherited from succession to the throne by his grandfather, Andronikos II, due to conflicts and power struggles within the Byzantine Empire. This decision sparked a civil war between the two Andronikoi, with Andronikos III eventually emerging victorious and becoming emperor in 1328. The conflict not only divided the Byzantine aristocracy but also weakened the empire, making it more vulnerable to external threats.