St Gregory Palamas (1359)

The teaching of St Gregory is so fundamental to Orthodoxy that he is especially commemorated each year in Great Lent on the Sunday following the Sunday of Orthodoxy (as well as on Nov. 14); Bishop Kallistos observes in the English edition of the Philokalia, “his successful defence of the divine and uncreated character of the light of Tabor…[is] seen as a direct continuation of the preceding celebration, as nothing less than a renewed Triumph of Orthodoxy.”