The Gelasian Sacramentary serves as the earliest agent for development of payers in the other sacramentaries of the Roman rite, including the present Roman Missal. Proper understanding of this sacramentary presupposes clarification of two popular misunderstanding about Gelasian Sacramentaries. First of all, this sacramentary was originally attributed to Pope Gelasius (492-496 C.E.), however, later studies revealed that Gelasius was not the author. Nevertheless, the prayers composed by Gelasius are preserved in this sacramentary. Gelasius was also author of certain prayers found in Leonine Sacramentary. Secondly, for a long-time liturgical historians failed to identify two types of Gelasian sacramentaries: the Old Gelasian Sacramentary and the Eighth-Century Gelasian which is also known as Frankish-Gelasian. The entries in library catalogues indicates that during the middle ages they were not aware of these two types. Hence, it is important to explain these types of Gelasian Sacramentaries which had influence on the Post-Tridentine Missal as well as Post-Vatican II editions of the Roman Missal.
 MIssale Romanum of Pius V promulgated by “Quo primum” in 1570 Missale Romanum (1570): Editio Princeps, Libreria Editrice Vaticana, 1998.
 Missale Romanum: Editio Typica, Libreria Editrice Vaticana, 1970. MIssale Romanum: Editio Typica Altera, Libreria Editrice Vaticana, 1975. Missale Romanum: Editio Typica Tertia, Libreria Editrice Vaticana, 2002.