The letter of Constantine to which you refer is taken from Eusebius' "Life of Constantine". If you click here you will open the third book of the life of Constantine, in the original Greek.
Page down to section XVIII. That is the letter to which you refer. The sixth word is "Pascha" -- pi, alpha, sigma, chi, alpha.
113 posted on 04/03/2007 1:19:34 PM PDT by Campion
("I am so tired of you, liberal church in America" -- Mother Angelica, 1993)