The holy God-crowned Emperor Constantine the Great (May 21) built a church in Constantinople in honor of the Twelve Apostles. There are instructions for celebrating this Feast which date from the fourth century.
For lists of the Apostles’ names, see: Mt.10:2, Mark 3:14, Luke 6:12, Acts 1:13, 26.
Troparion — Tone 4
Note: The troparion for June 30 is the same as June 29.
Kontakion — Tone 2
Podoben: “Seeking the highest...” / Today Christ the Rock glorifies with highest honor / Peter, the rock of faith and leader of the apostles, / together with Paul and the company of the twelve, / whose memory we celebrate with eagerness of faith, / giving glory to the One Who gave glory to them.