The following paragraph is taken from the "Catholic Almanac"

A disciple of Jesus whom the faithful 11 Apostles chose to replace Judas before the Resurrection; uncertain traditions report that he preached the Gospel in Palestine, Cappadocia or Ethiopia; in art is represented with a cross and a halberd, the instruments of his death as a martyr; May 14 (Roman Rite) Aug. 9 (Byzantine Rite).

St Matthias was not one of the original Apostles but was chosen by the other Apostles and Peter when Judas left their rank. According to Act 1:15-26, during the days after the Ascension, Peter stood up in the midst of the brothers (about 120 of Jesus' followers). Now that Judas had betrayed his ministry, it was necessary, Peter said, to fulfill the scriptural recommendation: "May another take his office." "Therefore, it is necessary that one of the men who accompanied us the whole time the Lord Jesus came and went among us, beginning from the baptism of John until the day on which he was taken up from us, become with us a witness to His resurrection" Act 1:21-22.


Matthew the tax collector

Patron Saint: Bankers
Additional Patronages: Bookkeepers
Also Known as: Matthew the Apostle
Name Meaning: Gift of God
Prayer of St. Matthew the Apostle:

O Glorious Saint Matthew, in your Gospel you portray Jesus as the longed-for Messiah who fulfilled the Prophets of the Old Covenant and as the new Lawgiver who founded a Church of the New Covenant. Obtain for us the grace to see Jesus living in his Church and to follow his teachings in our lives on earth so that we may live forever with him in heaven. Amen.

Why he is venerated by the Holy Roman Catholic Church:

Apostle of Jesus Christ
Originally a tax collector. Almost instantly, changed his ways to walk with Christ
Wrote the Book of Matthew in the Bible
Preached the Message of Christ to the Jews in the east until he died