The Synaxis of the Glorious and All-Praiseworthy Twelve Apostles of Christ appears to be an ancient Feast. The Church honors each of the Twelve Apostles on separate dates during the year, and has established a general commemoration for all of them on the day after the commemoration of the Glorious and First-Ranked among the Apostles Peter and Paul.
The holy, glorious, all-laudable Apostle and Evangelist, virgin, and beloved friend of Christ, John the Theologian is also commemorated on September 26 and May 8. He and his brother James are the sons of Zebedee, and were called “sons of Thunder” (Mark 3:17).
For lists of the Apostles’ names, see: Mt.10:2, Mark 3:14, Luke 6:12, Acts 1:13, 26.