The Order of Aviz is a Portuguese religious order of knights.鈥楢fter the conquest of Aviz the military castle erected there became the motherhouse of the order; and they were then called Knights of St. Benedict of Aviz; since they adopted the Benedictine rule in 1162. They were indebted to the Cistercians for their rule and their habit \ a white mantle with a green fleur-de-lysed cross.'Handcolored copperplate engraving of a knight from a religious military order from Robert von Spalart's 鈥楬istorical Picture of the Costumes of the Principal People of Antiquity and of the Middle Ages' (1796).