How did Saint Matthias become an Apostle?

When making a decision on whom to choose to replace Judas Iscariot after his death, the remaining 11 Apostles proposed two candidates who met the requirements: Joseph called Barsabbas (who was also known as Justus), and Matthias.

They prayed for the Lord to show them which of the two he had chosen for the mission, and they cast lots for the two men; “the lot fell on Matthias; and he was enrolled with the eleven apostles” (Acts 1: 26). This was the last time lots were cast to make a decision since, after Pentecost, the Holy Spirit would then lead them in their decisions.