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When did Justinian I rule the Byzantine Empire?

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Mosaic detail of Emperor Justinian I with a jeweled crown and halo, wearing ornate robes, from the Church of San Vitale in Ravenna, Italy. — Justinian I Justinian I, detail of a mosaic in the Church of San Vitale, Ravenna, Italy.

Justinian I served as the emperor of the Byzantine Empire from 527 to 565.12