Name of the cult centre of the god Sarapis in Alexandria, built by Ptolemy III and razed to the ground in 391 BC on the orders of Theodosius. The complex contained pylons, obelisks, a number of temples, including one dedicated to Anubis, and underground galleries in which jackals were once buried (in relation with the temple of Anubis). Parts of the library were also located here. In the main temple was the famous cult statue of Sarapis, made by Briaxis. The name Serapeum is also used to refer to the burial place of the Apis bulls at Saqqara, an underground complex to the north west of the Step Pyramid of Djoser. From the 18th Dynasty to Ptolemaic times at least, bulls were buried here in enormous granite sarcophagi. Not far away was also the tomb of one of the sons of Ramses II, Prince Khaemwaset, who constructed part of the Serapeum.