Saint Matthias is known as the apostle chosen to replace Judas Iscariot after his betrayal of Jesus Christ. According to the New Testament, Matthias was selected by the remaining eleven apostles through prayer and the casting of lots, highlighting the importance of divine guidance in their decision-making. Matthias is traditionally recognized as a martyr, with various accounts suggesting he preached in different regions, including Judea and Ethiopia. His feast day is celebrated on February 24 in the Western Christian calendar, and he is often depicted in art holding a book or a sword, symbolizing his role as a witness to the teachings of Christianity.