Pyramid of Lisht
Two major pyramids are known to have been built at Lisht — those of Amenemhat I and his son, Senusret I. The latter is surrounded by the ruins of ten smaller subsidiary pyramids. The site which is in the vicinity of the oasis of Fayyum, midway between Dahshur and Meidum, and about 100 kilometres south of Cairo, is believed to be in the vicinity of the ancient city of Itjtawy (the precise location of which remains unknown), which served as the capital of Egypt during the 12th Dynasty.
Source: http://en.wikipedia.org/wiki/Egyptian_pyramids