When a strong central authority protects borders and reduces internal — Marilyn Stokstad

"As they captured each territory, William and his men secured their camps with simple earth and timber defenses characteristic of northern Europe (...). These wooden structures have disintegrated, but sometimes their earthen mounds survive as rolling hills or picturesque elements in the landscape. Timber castles were especially useful to a warrior king like William the Conqueror who moved rapidly to bring new territories under control. The earth and timber castles could be built quickly, since the newly moved earth did not have to support great weight. Such structures were also relatively cheap because they required no specialized masons and expensive stone. Since the timber building tradition was widespread both in the British Isles and on the continent, the carpenters knew the building techniques. These castles were essentially towers and stockades; they provided garrison headquarters as well as residences."

"The Church attempted to regulate this rather violent society, and eventually a code of honor evolved known as the code of chivalry. (...) Those who aspired to be knights had to have aristocratic ancestors and wealth enough to own warhorses and armor and to provide for a team of supporters."

"Women played a greater role than might be expected in this elite warrior society, as heiresses and chatelaines in charge of castles (see Documents 44–53). Since land was the basis of status and power, estates were kept intact by being passed on to the oldest son rather than being divided among all the children. In spite of high infant mortality and short life expectancies, a family hoped that at least one son survived to inherit lands and titles. Younger sons hoped to gain an estate of their own by marrying an heiress."

"The castle was far more than a walled and turreted fortress; it was an instrument of social control and the symbol of power, authority, and wealth."

"Never as neat or well organized as many descriptions suggest, in essence feudalism involved the exchange of grants of land for military and political service, sealed by personal oaths between the lord and the vassal. The castle has been called the perfect architectural expression of the European feudal age."

"A sharp contrast existed between the upper classes who constantly moved from manor to manor and the peasants who were tied to the land and lived in agricultural villages outside the castle walls. Yet economic opportunities expanded for both groups."