A knight is a person granted an honorary title of knighthood by a head of state (including the Pope) or representative for service to the monarch, the church or the country, especially in a military capacity. Knighthood finds origins in the Greek hippeis and hoplite and Roman eques and centurion of classical antiquity.
Un chevalier est une personne qui a reçu un titre honorifique de chevalier par un chef d'État (y compris le pape) ou un représentant pour le service au monarque, à l'église ou au pays, en particulier à titre militaire. La chevalerie trouve ses origines dans les hippeis et hoplites grecs et les eques et centurions romains de l'antiquité classique.
A military order (Latin: militaris ordo) is a Christian religious society of knights. The original military orders were the Knights Templar, the Knights Hospitaller, the Order of Saint James, the Order of Calatrava, and the Teutonic Knights. They arose in the Middle Ages in association with the Crusades, both in the Holy Land and in the Iberian peninsula; their members were dedicated to the protection of pilgrims and the defence of the Crusader states. They are the predecessors of chivalric orders.
Most members of military orders were laymen who took religious vows, such as poverty, chastity, and obedience, according to monastic ideals. The orders owned houses called commanderies all across Europe and had a hierarchical structure of leadership with the grand master at the top.