St. Mark of Ephesus ca. 1392-1444
Latins must not be re-baptized but only after the renunciation of their heresies and confession of sins, be anointed with Chrism and admit them to the Holy Mysteries and in this way bring them into communion with the holy, catholic Eastern Church, in accordance with the sacred canons. (Acts of the Moscow Councils 1666-1667, Moscow, 1893, pp. 174-175)