Tiberius II Constantine was Eastern Roman emperor from 574 to 582. Tiberius rose to power in 574 when Justin II, prior to a mental breakdown, proclaimed him caesar and adopted him as his own son. In 578, the dying Justin II gave him the title of augustus, thus becoming co-emperor alongside him. Tiberius became sole ruler less than two weeks later, assuming the regnal name of "Constantine" under which he reigned until his death.

Justin II was Eastern Roman emperor from 565 until 578. He was the nephew of Justinian I and the husband of Sophia, the niece of the Empress Theodora, and a member of the Justinian dynasty.