Why did Justin I seek help from his nephew Justinian I?

Justin I was the Byzantine emperor from 518. When the northern frontier became endangered by Slavs invading the Balkan provinces, he realized he was incapable of repelling them, so he sought his nephew´s, Justinian, help.

Explanation:

Later on, Justinian would become Justin´s co-emperor and Emperor after the ruler´s death.

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