John IX Agapetos

John IX Agapetos, called the Hieromnemon, was Patriarch of Constantinople from 1111 until his repose in 1134. He is commemorated on 18 July in some synaxaria as a locally honoured saint; his existence as a saint, the details of his life and the day of commemoration are not confirmed by sure sources, and no canonization is known.

He was a learned hierarch. The name Hieromnemon comes from an office he held in the Ecumenical Patriarchate before being elected to the patriarchal throne. During his patriarchate efforts were made to bring the Orthodox and Catholic Churches closer and to heal the schism; they did not succeed. A synod was also convened that condemned the doctrinal deviations of Eustratios of Nicaea, who had leaned toward Nestorianism.