South of Arṣūf-Apollonia, on the western edge of the modern city of Herzliya (Israel), at the top of a limestone hill overlooking the sea, stands a rectangular fortress-like building (Fig. 1), commonly known as Mashhad Sayyidnā ‘Alī – a name derived from that of ‘Alī b. ‘Alīm, who lies buried there. The story of Sayyidnā ‘Alī, which I would like to set forth in this article, combines three intertwined aspects that shed light on Muslim Palestine and Syria (bilād al-shām) in the Middle Ages.