The First Dynasty of covers the first Egyptian kings to rule over a unified Egypt. It immediately follows the unification of Upper and Lower Egypt, most likely by king Narmer, and marks the beginning of Egyptian historical times. The center of power was centered at the yet to be discovered city of Thinis. Very few details of this dynasty has survived. The large tombs of the kings were built mainly of wood with only some small use of stone for the walls and floors. It is thought that human sacrifice was part of the funerary ceremonies, as many smaller tombs were found adjacent to tombs of the kings.