To honour the dignity of the “prince” (Introit) to whom Jesus has committed the power of the keys (Collect), the Church instituted the feast of the “Chair of St Peter,” which is found in the Roman calendar at this date since the year 354.
As it often falls in Lent, certain churches celebrated it at an earlier date, in January. Hence the two feasts of the Chair of St Peter, which the Church distinguished by connecting the more ancient one [Rome, until the sixteenth century, only celebrated this date], on February 22nd, with the Chair at Antioch, and the one on January 18th with the Chair of Peter at Rome. St Peter indeed resided for some time at Antioch about the years 51-52. Continue Reading