Saint Matthias, (flourished 1st century ad, Judaea; d. traditionally Colchis, Armenia; Western feast day February 24, Eastern feast day August 9), the disciple who, according to the biblical Acts of the Apostles 1:21–26, was chosen to replace Judas Iscariot after Judas betrayed Jesus.
https://www.britannica.com/biography/Saint-Matthias