Djoser's pyramid is the oldest complete stone building complex known in history, built in the Third Dynasty. Another 16 Egyptian kings built pyramids at Saqqara, now in various states of preservation or dilapidation. High officials added private funeral monuments to this necropolis during the whole pharaonic period. It was an important complex for non-royal burials and cult ceremonies for more than 3,000 years, well into Ptolemaic and Roman times.