Djoser was an ancient Egyptian pharaoh of the 3rd Dynasty during the Old Kingdom, and was the founder of that epoch. He is also known by his Hellenized names Tosorthros and Sesorthos. He was the son of King Khasekhemwy and Queen Nimaathap, but whether he was also the direct successor to their throne is unclear. Most Ramesside king lists identify a king named Nebka as preceding him, but there are difficulties in connecting that name with contemporary Horus names, so some Egyptologists question the received throne sequence. Djoser is known for his step pyramid, which is the earliest colossal stone building in ancient Egypt.

Sneferu, well known under his Hellenized name Soris, was the founding pharaoh of the Fourth Dynasty of Egypt during the Old Kingdom. Estimates of his reign vary, with for instance The Oxford History of Ancient Egypt suggesting a reign from around 2613 to 2589 BC, a reign of 24 years, while Rolf Krauss suggests a 30-year reign, and Rainer Stadelmann a 48-year reign. He built at least three pyramids that survive to this day and introduced major innovations in the design and construction of pyramids.