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 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.
On the Exaltation of the Cross
There is a Greek homily on the exaltation of the cross by one Callistus, but whether it is the work of our Callistus, or of another who was patriarch of Constantinople in A. D. 1406, is uncertain.
This is printed with a Latin translation in Gretser (De Cruce, ii. p. 1347).
Other theological works ascribed to a Callistus
There are some other works of a theological nature which are ascribed to one Callistus, but they have never been printed.
Wharton's Appendix to Cave, Hist. Lit.
i. p. 46, &c., ed. London.