Jerome — as excerpted in the Catena Aurea on Mark 1:1

“(in Prolog.) Mark the Evangelist, who served the priesthood in Israel, according to the flesh a Levite, having been converted to the Lord, wrote his Gospel in Italy, shewing in it how even his family benefited Christ. For, commencing his Gospel with the voice of the prophetic cry, he shews the order of the election of Levi, declaring that John the son of Zachariah was sent forth by the voice of an angel, and saying, The beginning of the Gospel of Jesus Christ, the Son of God.”