"Serapis" is a historical novel written by German author Georg Ebers. The novel follows the character of Publius, a Roman centurion who is sent to Alexandria to investigate the disappearance of a group of soldiers. The novel explores the tension between the traditional Egyptian religion and the new cult of Serapis, which was created by the Ptolemaic dynasty as a fusion of Greek and Egyptian religious beliefs. The conflict comes to a head when the Roman emperor Hadrian arrives in Alexandria and attempts to resolve the tensions between the two religions. The novel is notable for its vivid descriptions of ancient Alexandria, its customs, and its people. Ebers' extensive research into the history of the period is evident in the novel's attention to detail and historical accuracy. The novel also explores themes such as power, loyalty, and the clash of cultures.