Justinian I died on the night of 14 to 15 November 565. , the "praepositus sacri cubiculi", seems to have been the only witness to his dying moments, and later claimed that Justinian had designated "Justin, Vigilantia's son" as his heir in a deathbed decision. The clarification was needed because there was another nephew and candidate for the throne, Justin, son of Germanus. Modern historians suspect Callinicus may have fabricated the last words of Justinian to secure the succession for his political ally. As historian Robert Browning observed: "Did Justinian really bring himself in the end to make a choice, or did Callinicus make it for him? Only Callinicus knew."