XIR154000 St. Pachomius (d.346) (mosaic) by Byzantine School, (12th century); Duomo (Cattedrale di Santa Maria Nuova), Monreale, Sicily, Italy; (add.info.: founder of Christian community monasticism in Egypt; wrote first book of monastic observance; rules of the Computus said to have been disclosed to him by an angel; Computus was the set of tables used in Middle Ages to calculate the date of future Easters;); out of copyright.