He is the author of the moral philosophical essay De contemnenda morte ("On Despising Death"), an Apologia for his conversion to Catholicism, and a voluminous collection of 447 letters, valuable for the history of Byzantine relations with the West.
He wrote the essay "On Despising Death" ("De contemnenda morte"), an Apologia for his religious conversion, and a large collection of 447 letters, which provide insights into Byzantine-Western interactions.