The document provides information on the Norman Conquest of England in 1066, when William the Conqueror defeated King Harold and established Norman rule. It then discusses the effects of the conquest, including the compiling of the Doomsday Book to inventory land for taxation and the introduction of feudalism. The rest of the document focuses on the system of feudal knighthood and chivalry that developed after the conquest, including the roles and duties of knights, the concept of courtly love, and the knightly orders that formed.