text: Villages were usually oriented around a central plaza that was used for games (chunkey) and ceremonial purposes. In the center of the plaza was a cedar tree surrounded by a vertical wood enclosure. The shrine represented the "Lone Man", one of the main figures in Mandan religion. He was said to have built a wooden corral that saved the people of a village from a flooding river in North Dakota. Villages were often situated on high bluffs above the river. Often, villages would be constructed at the meeting of tributaries, in order to use the water as a natural barrier. Where there were few or no natural barriers, the villages built some type of fortification, including ditches and wooden palisades.
  Family life
  The Mandan were originally divided into thirteen clans, which were reduced to seven by 1781, due to population losses in the smallpox epidemic. Ninety percent of the population died in the 1837-1838 smallpox epidemic. By 1950 only four clans survived.
  Historically clans organized around successful hunters and their kin. Each clan was expected to care for its own, including orphans and the elderly, from birth to death. The dead were traditionally cared for by their father's clan. Clans held a sacred or medicine bundle, which consisted of a few gathered objects believed to hold sacred powers. Those in possession of the bundles were considered to have sacred powers bestowed to them by the spirits and thus were considered the leaders of the clan and tribe. In historic times, the medicine bundles could be purchased, along with knowledge of the rites and rights associated with them, and then inherited by offspring.