Apollonia (; ), known in the Early Islamic period as Arsuf () and in the Crusader Kingdom of Jerusalem as Arsur, was an ancient city on the Mediterranean coast of what is today Israel. In Israeli archaeology it is known as Tel Arshaf (). Founded by the Phoenicians during the Persian period in the late sixth century BCE, it was inhabited continuously until the Crusader period, through the Hellenistic, Roman, and Byzantine periods, during the latter being renamed to Sozusa (, or "Sozusa in Palaestina" to differentiate it from Sozusa in Libya).