The god Serapis was a Graeco-Egyptian deity which combined the worship of Osiris and Apis. The cult was introduced across Egypt by the Hellenistic ruler Ptolemy I Soter to unite both the Greek and Egyptian cultures within the Ptolemaic Kingdom. Serapis was Greek in appearance but held Egyptian attributes. Serapis was labelled as the patron god of the Ptolemaic kingdom and of the city of Alexandria. His popularity continued into the Roman Empire, where he was fashioned as the consort of Isis outside of Egypt.