Malchus was a 5th-century Byzantine historian of an Arab origin from the city of Philadelphia. According to the Suda, Malchus was a Byzantine ; but Photius states that he was a native of Philadelphia; the ancient Rabbah in the country of Ammonitis, east of the River Jordan. His name makes it probable that he originally came from the Arab people around Philadelphia, as his name is alike the Arab name Malek (مالك).
