[W]omen deacons…fulfilled a certain ministry in the clergy. At present, they are almost entirely unknown. Except there are some who say that they served in the baptizing of women because it was not proper for these naked women who were baptized after puberty to be seen by the eyes of men. Others say that it was permissible for them to even enter the holy altar and to share the things of male deacons nearly equally with them. However, women deacons were later forbidden by the Fathers both to enter the altar and to practice the things of their ministry on account of the involuntary monthly flow. That the holy altar was formerly accessible to women is to be inferred from many other authorities and especially the funeral oration that the great Gregory the Theologian had made upon his sister (Homily 8). However, it does not appear plausible to me that a woman became a deacon of the Sacred and Bloodless Sacrifice, as there is no sound reason why women, who are not permitted to teach in public, should be raised to the rank of diaconate, whose work is to purify orally those unbelievers, that come forward for baptism.
Furthermore, the most ancient of the books in which the rites of all ordinations have been accurately recorded, also indicate that the age of a deaconess must be forty; that her schema must be monastic and perfect; that during her life, she must contend for virtue with the most excellent of men; and that as much as is solemnized in her ordination, short of a little, is also celebrated in the case of male deacons. Thus, she who draws herself to the sacred table, before its uplifted heights, is covered with a veil. After the exclamation, “The Divine Grace which heals infirmities,” she does not kneel, but only bows her head. The archpriest, who places his hand upon her, prays that she who seeks a chaste and seemly way of life fulfills the work of deaconess blamelessly, and in this way devotes herself to the holy temples. Indeed, the books do not permit her to minister the Undefiled Mysteries or to be entrusted with a fan as in the manner of male deacon. Next, the the diaconal orarion is placed around her neck under the veil by the archpriest, who brings its two ends together in front. During the time of Communion, she partakes of the Divine Mysteries after the male deacons. Then, she who receives the chalice from the hands of the archpriest distributes nothing, but immediately places it on the holy table. (An Alphabetical Collection of All Subjects That are Contained in the Sacred and Divine Canons, prepared and at the same time organized by Matthew, the least among Hieromonks. excerpted from Viscuso, “Sexuality, Marriage, and Celibacy in Byzantine Law” pp. 110-112)