Feudalism and the Manor

Picture power not as a government but as a personal contract repeated at every level. A king grants a large estate, a fief, to a noble in exchange for a promise: military service and loyalty. That noble, now a lord, carves off pieces of his land to grant to lesser nobles, his vassals, who owe him the same service in miniature. Each lord runs his own fief with his own soldiers, courts, and taxes. The king has a title but no standing army of his own and no bureaucracy reaching into every county. He depends on lords who honor their oath voluntarily, which they often didn't.

At the bottom of that chain sits the manor, the lord's estate and the peasants who work it. A manor grows its own grain, grinds it in its own mill, presses its own grapes or apples, and often includes a blacksmith, a church, and pasture for animals, so it rarely needs to trade outside its fences. Peasants, most of them serfs, farm strips of land for themselves and owe labor, a share of crops, and dues to the lord in exchange for his protection and the right to work that land. A serf cannot be bought or sold as property and cannot simply be killed at the lord's whim, but a serf also cannot leave the manor without permission, which ties them to the land in a way free peasants were not.

This arrangement explains why Europe looked so fragmented next to a centralized state like Song China, where appointed officials answered directly to an emperor. It also sets up its own unraveling: once plague kills off a huge share of the labor force in the mid-1300s, lords suddenly need peasants more than peasants need lords, and the obligations holding the whole system together start to loosen.