3. A monk of mount Athos.
During the war between Palaeologus and Cantacuzenus he was sent by the monks to Constantinople to endeavour to restore peace; but he was ill-treated there by the empress Anna and the patriarch Joannes. About the year A. D. 1354, the emperor Cantacuzenus made Callistus patriarch of Constantinople. The year after, when he was requested by the same emperor to crown his son Matthaeus, Callistus refused to comply with the request and withdrew to a monastery. As he refused to perform his duties as patriarch, Philotheus was appointed in his
580
place. But when afterwards Joannes Palaeologus had gained possession of the imperial throne, Callistus was restored to the patriarchal see. The year after his restoration he was sent as ambassador to the Servian princess Elizabeth to conclude a peace, and during this embassy he died near Pherne, the capital of the Servians.[L.S]