Justin II biographical name
(died Oct. 4, 578) Byzantine emperor (565–78). He tolerated the Monophysite heresy until 571, then began to persecute its followers. Despite an alliance with the Franks, Justin lost parts of Italy to the Lombards after 568. He also suffered defeats at the hands of the Avars, to whom he promised to pay tribute (574), and the Western Turks, who seized lands in the Crimea. He invaded Persia in 572, but the Persians repulsed his army and invaded Byzantine territory, capturing Dara in 573. He became insane, and his general Tiberius (his adopted son) was effective ruler of the empire after 574.
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