تحفة النظار في غرايب الامصار وعجايب الاسفار 13.68.3

13.68.3

It is their custom there that every ship passing a town must anchor there and give the ruler of the town a present, which they call the ḥaqq al-bandar (harbour due). Whoever does not do so, they go out after him in their ships, bring him into the harbour by force, double the impost on him, and prevent him from sailing for as long as they please.