Some of the feats, which were seen as Justinian greatest achievement for the Byzantine Empire includes:
Also known as Justinian the Great, was an Eastern Roman emperor from 527 to 565. His reign was marked by the ambitious restoration of the Empire which was expressed by the partial recovery of the territories of the defunct Western Roman Empire.
Some of his campaigns re-established the Roman's control over the western Mediterranean, increasing the Empire's annual revenue by over a million solidi. During his reign as well, he subdued the Tzani, who is a people on the east coast of the Black Sea that had never been under Roman rule before and He engaged the Sasanian Empire in the east during Kava's reign.
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