This study sets out all the provisions for initiation in the Byzantine tradition, drawing on early manuscripts of the euchology and the typikon of the Great Church (Hagia Sophia). The sections of the book provide texts and commentary for enrolment of children in the rites of the eighth and fortieth days, catechesis and prayers during Lent, final preparations, including consecration of Chrism and the rites of apotaxis and syntaxis on Good Friday, Baptism at the Easter Vigil, postbaptismal rites and rites of closure, and provisions for the other baptismal feasts.