Most of the present Western Rite liturgies have been developed along the guidelines given to Saint Tikhon by the Holy Synod in 1904/07. As noted above, Tikhon's request to the Holy Synod concerned accepting Episcopal parishes into the Orthodox Church while permitting them to retain the liturgies of the Book of Common Prayer. While Saint Tikhon's request was specifically concerned with Anglicans converting, its recommendations came to be implemented for those parishes who did not have a specifically Anglican background. The two most important required changes included the removal of the "filioque" from the Nicene Creed and the addition of an epiclesis which specifically invokes the Holy Spirit and a petition for the Spirit to change the bread and wine into the Body and Blood of Christ.