At its peak in the sixteenth century, the Zimbabwe Culture encompassed an area the size of France. The greater Tuli area in east-central Botswana formed the western extent of this culture area. Here many dzimbahwe mark the residences of sacred leaders in the later Khami period (1400–1840 ad). These stone-walled headquarters formed a pyramid of political importance, with district chiefs (Level 4) and petty chiefs (Level 3) at the top and headmen (Level 2) and commoners (Level 1) at the base. Commoners and their headmen lived near arable land, while petty chiefs placed their administrative centres at the boundaries of their small chiefdoms. In death, sacred leaders rested in dzimbahwe on special hills, while ordinary villagers were buried in their homesteads. During the Khami period in Botswana, these various settlements were part of only one Level 4 district: Level 5 and Level 6 capitals were located elsewhere. After the collapse of the powerful Torwa state at Khami, decorative symbols changed from emphasizing the majesty of kingship (Khami) to the responsibilities of sacred leaders (Zinjanja), and then back again to kingship in the Rozvi state (Danangombe). The powerful Rozvi state did not extend to the Tuli area, probably because it was too dry.