Arethas of Najran was a 6th-century Miaphysite Christian leader residing in Najran. During his leadership, the local Christian community faced severe persecution under the Yemeni king Dhu Nuwas. This conflict eventually drew military intervention from the Byzantine Empire and the Aksumite Kingdom, who sought to end the violence through the Siege of Najran. He is traditionally identified as the ancestor of the Banu al-Harith tribe and is recognized as a saint in several Christian traditions.