
Nephew of Justinian who went mad.
Compare Justin II with another historical figure:
Justin II, seeking to restore Roman prestige, refused to pay the annual tribute to the Sassanid Persians and initiated a war. The conflict initially went poorly for the Byzantines, leading to the loss of the fortress of Dara and a heavy defeat.
Overwhelmed by military defeats and the loss of Dara, Justin II suffered a period of insanity. He became incapable of ruling, leading to the appointment of Tiberius II as Caesar and regent.
In a moment of lucidity, Justin II formally adopted Tiberius, the commander of the excubitors, as his son and appointed him Caesar. This act ensured a stable transition of power and placed a capable ruler in charge of the empire.
See how Justin II stacks up against other historical figures