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.
The author penned the moral philosophical work "On Despising Death," which serves as an Apologia for his conversion to Catholicism, along with a substantial body of 447 letters that are crucial for understanding Byzantine-Western relations.