 Complete the following phrase:  He first appears in 1429, as governor kephale of Vostitza modern Aigio, taking part in the siege of Patras by the Despot of the Morea and later last Byzantine Emperor Constantine Palaiologos. An opponent of the Union of the Churches, he corresponded with Gennadios Scholarios and Bessarion who composed a treatise on the procession of the Holy Spirit for him, and took part in the 1439 