Mark of Ephesus, born in the year one thousand three hundred ninety-two, was a prominent philosopher, theologian, and Eastern Orthodox priest during the late Palaiologan period of the Byzantine Empire. Renowned for his hesychast theological perspectives, he became a significant figure in the religious landscape of his time.
Initially, Mark participated in the Council of Ferrara–Florence, where he was a delegate for the Patriarch of Alexandria and served as the Metropolitan of Ephesus. His early stance was one of openness towards the potential union of the Eastern and Western Churches. However, as discussions progressed, he authored several critical theological works, including 'Ten Arguments Against the Existence of Purgatory' and 'Chapters Against the Latins,' which reflected his growing concerns about the inconsistencies between Western teachings and the dogmas established by the Ecumenical Councils.
As the council's proceedings unfolded, Mark's position shifted dramatically. He ultimately renounced the union, declaring it a lost cause and emerging as a leading voice of opposition against the Union of Florence. This pivotal decision solidified his legacy as a staunch defender of Eastern Orthodoxy, earning him a revered status within the Eastern Orthodox Church.