Over the course of the Middle Ages, the Indian Ocean effectively became a Muslim lake. Muslim traders appear to have played a key role in establishing the principle that kings and their armies should keep their quarrels on dry land; the seas were to be a zone of peaceful commerce. At the same time, Islam gained a toehold in trade emporia from Aden to the Moluccas because Islamic courts were so perfectly suited to provide those functions that made such ports attractive: means of establishing contracts, recovering debts, creating a banking sector capable of redeeming or transferring letters of
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