Today is the Feast of Saint Peter's Chair at Antioch, since it is February 22nd. However, in this year (2013), keep in mind that today is also still the Ember Friday of Lent.
The Church celebrates the Feast of St. Peter's Chair at Rome on January 18th of each year. The feast of the Chair of Saint Peter at Antioch follows and commemorates his foundation of the See of Antioch. At each place a chair (cathedra) was venerated which the Apostle had used while presiding at Mass. It is still done to this day.
This feast commemorates the seven years during which Pope Peter ruled the Church from Antioch before he went to Rome. Since the majority of the Jews had rejected Christianity, Peter left Jerusalem and founded the see of Antioch among the Gentiles. In that large Eastern city, Christianity took deep root, and it was there that the faithful were first called by the name of Christians. After seven years the Vicar of Christ transferred his see to Rome, the very center of the ancient world, so that from it the messengers of salvation might radiate to the uttermost ends of the earth.
Prayer (1962 Collect):
O God, You have entrusted the keys of the kingdom of heaven to Your blessed apostle Peter and have given him the power of bishop to bind or to loose. May his intercession free us from the slavery of sin; who lives and rules with God the Father . . .