St. Barnabus
St. Barnabas, designated by the Holy Spirit to share the charge and mission of the twelve Apostles, is venerated by the Church as one of them. He played an important part in the first extension of Christianity outside the Jewish world. It was Barnabas who presented St. Paul to the other Apostles when, after his long retreat in Arabia, he came to Jerusalem for the first time after his conversion to submit for Peter’s approval the mission to the Gentiles entrusted to him by the Master Himself. Barnabas was Paul’s companion and helper on his first missionary journey and returned with him to Jerusalem, but left him when he set out on his second journey and went to Cyprus. The name of St. Barnabas is mentioned in the Canon of the Mass.
According to the 1962 Missal of St. John XXIII the Extraordinary Form of the Roman Rite, today is the feast of Corpus Christi which traditionally is celebrated on the Thursday after Trinity Sunday. In the Ordinary Form the Solemnity is celebrated on the Sunday after Trinity Sunday.