Among the numerous scholars who resided at the Monastery during the late-Ottoman era was the Archimandrite Leontios Kaisareus, who was connected with the Monastery since 1832. Being the friend of the Patriarch Gregorios VI, he practised at the Great Church of Christ and served the community of the faithful in Konstantinople, and also worked in Thessaloniki as a teacher and preacher. He participated in the Central Ecclesiastical Committee of the Patriarchate, where in Konstantinople in 1843, he edited the patriarchal edition of the corrected Μηναίων (monthly calendar of religious feasts), a valuable, monumental work. Upon arriving at Mt Athos, he originally resided at the St Panteleimonos Monastery, and moved to the Xenofontos Monastery from there, where he resided until his death in 1852. He left a part of his library of important manuscripts to the Monastery as a legacy.
