Answer :
Justinian ruled from 527 to 565 AD.
centuries are counted by the year that will happen at the end of them: 600. so it's the 6th century AD. (he was born in the 5th century though) .
centuries are counted by the year that will happen at the end of them: 600. so it's the 6th century AD. (he was born in the 5th century though) .