The Brethren or Brethren of the Coast were a loose coalition of pirates and privateers commonly known as buccaneers and active in the seventeenth and eighteenth centuries in the Atlantic Ocean, Caribbean Sea and Gulf of Mexico.
They were a syndicate of captains with letters of marque and reprisal who regulated their privateering enterprises within the community of privateers and with their outside benefactors. They were primarily private individual merchant mariners of Protestant background usually of English and French origin.
During their heyday when the Thirty Years War was devastating the Protestant communities of France, Germany and the Netherlands while England was engaged in various conflicts, the privateers of these nationalities were issued letters of marque to raid Catholic French and Spanish shipping and territories.
Based primarily on the island of Tortuga off the coast of Haiti and in the city of Port Royal on the island of Jamaica, the original Brethren were mostly French Huguenot and British Protestants, but their ranks were joined by other adventurers of various nationalities including Spaniards, and even African sailors, as well as escaped slaves and outlaws of various sovereigns.
In keeping with their Protestant and mostly Common Law heritage the Brethren were governed by codes of conduct that favored legislative decision-making, hierarchical command authority, individual rights, and equitable division of revenues.