Apollonia was an ancient city in Hellenistic and Roman Judea, in the Byzantine period renamed to Sozusa . It was situated on a cliff above the Mediterranean Sea, about 34 kilometres south of Caesarea. 

It fell to the Muslim conquest in 640 and was fortified against Byzantine attacks and became known as Arsuf . In 1101 it was conquered by the Crusader Kingdom of Jerusalem, and was a strategically important stronghold in the Third Crusade, during which the Battle of Arsuf was fought nearby. The fortified city and the castle fell to the Mamluks in 1265, when both were completely destroyed. The site of Arsuf is now in Herzliya municipality, Israel. 

The site was intensively excavated from 1994. In 2002 Apollonia National Park was opened to the public.

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