"We celebrate your memory out of duty, O Constantine, and Equal-to-the-Apostles..."

Christ is risen! Truly He is risen!

St. Constantine the Great (source)

  
We celebrate your memory out of duty, O Constantine, and Equal-to-the-Apostles, the foundation and boast of all rulers, for you were illumined by the rays of the Spirit, and thereby gladden the whole Church of Christ, and the ranks of the faithful, who have gathered from all places to the radiant city of Nicea, in which the insolence of the impious ones was quenched, and the tongues of the heretics were proven foolish, while the ranks of the Orthodox were uplifted, and the faith was revealed. Therefore, you were glorified by them as being most Orthodox, and were proclaimed the father among rulers, as the first to have received the royal robe from God. Therefore, we entreat you, that we who celebrate your memory in faith might be granted forgiveness of sins upon our souls.
-Idiomelon of the Litia in the First Tone.
  
(source)

 

Sts. Constantine and Helen the Equals-to-the-Apostles (source)

   

Christ is risen from the dead, by death, trampling down upon death, and to those in the tombs, He has granted life!

Truly, the Lord is risen!