Matthias is the person chosen as one of the twelve apostles to replace Judas Iscariot after his death.
Acts 1:23So they nominated two men: Joseph called Barsabbas (also known as Justus) and Matthias.Acts 1:24Then they prayed, “Lord, you know everyone’s heart. Show us which of these two you have chosenActs 1:25to take over this apostolic ministry, which Judas left to go where he belongs.”Acts 1:26Then they cast lots, and the lot fell to Matthias; so he was added to the eleven apostles.