VACHAVIOLOS, Dimitrios. “Church Union and Balance of Powers in Late Byzantium: The Testimony of Georgios Sphrantzes”. Byzantina Symmeikta 31 (September 13, 2021): 379–400. Accessed May 21, 2025. https://ejournals.epublishing.ekt.gr/index.php/bz/article/view/23433.