Saint Mark the Evangelist authored the Gospel According to Mark. He was one of the 70 disciples of Jesus Christ. He and his mother, Mary, were integral in the early church movement; Mary opening up her home as a Christian meeting place. Also, Saint Mark’s journey with Saint Peter and Saint Barnabas is recorded in Acts as they traveled through Cyprus and Rome carrying the Word. Church writings accredit Saint Mark as founding the Church in Alexandria and consequently, serving as bishop there.

Source: About Today | Divine Office – Liturgy of the Hours of the Roman Catholic Church (Breviary)