The Transfiguration of Our Lord–W (II) – Sts. Sixtus II, Pope, Felicissimus & Agapitus, Martyrs–R (Comm.)
Thursday, August 6
The origins of the feast are less than certain and may have derived from the dedication of three basilicas on Mount Tabor. The feast was present in various forms by the 9th century, and in the Western Church was made a universal feast on August 6 by Pope Callixtus III to commemorate the lifting of the Siege of Belgrade (1456).