Answer:
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.
Justin I seek help from his nephew Justinian I when the Byzantine empire was in danger of being invaders.
The Byzantine Empire
Emperor Justin I was the Byzantine emperor in 518.
On the northern frontier, the Slavs crossed the Danube River and troubled the Balkan provinces, and Justin proved unable to repel them.
During his reign, he called his gifted nephew Justinian I to help him secure its borders in the northern frontier.
Learn more about the Byzantine Empire here:
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