Raiders of the Lost Tomb
North of Calimshan, Amn is a nation led by the representatives of five noble families. It is a place where the wealthy rule, openly and without pretense. Shrewd traders and ruthless in business, Amnians believe that the end of a successful transaction is justified by any means, ethical or otherwise.
Although the nation is richer by far than even the northern metropolises of Baldur's Gate and Waterdeep, its influence is curtailed by the unwillingness of its rulers to work together in the nation's best interest. The members of the Council of Five are fairly unified and tight-fisted in their control of Amn, but their ability to affect events outside their own borders is limited because they can't agree enough on major matters of foreign policy. The oligarchs utterly control their nation, but beyond the areas that each rules, their families and businesses compete with one another and with the locals of far-flung places.
The use of arcane magic is illegal in Amn, meaning that the only authorized spellcasters in the nation are wielders of divine magic who enjoy the support and patronage of a temple, and users of arcane magic who have been given special dispensation by one of the oligarchs. So pervasive is the sway of Amn's oligarchy that few crimes merit physical punishment but those that involve the use of arcane magic or an offense against one of the council's merchant houses. Other infractions are forgiven after the miscreant makes payment of an appropriate fine.
The merchants of Amn were in control of Port Nyranzaru until they were thrown out by the native people, sick of seeing their resources plundered by foreigners.