When he finally acquired a career as a cleric, he took an active part in the theological controversies between the Eastern Orthodox Church and the Roman Catholic Church, writing treatises on the Procession of the Holy Spirit, advocating the western usage. He was the tutor of the learned Theodore II Laskaris of the Nicaean Empire, and a great collector of classical texts.
As a cleric, he engaged in theological debates between the Eastern Orthodox Church and the Roman Catholic Church, producing works on the Holy Spirit's procession, advocating for the western tradition. He was the instructor of Theodore II Laskaris, the scholar from the Nicaean Empire, and amassed a vast collection of classical literature.