The earliest form of insurance is probably marine insurance, although forms of mutuality (group self-insurance) existed before that. Marine insurance originated with the merchants of the Hanseatic league and the financiers of Lombardy in the 12th and 13th centuries, recorded in the name of Lombard Street in the City of London, the oldest trading insurance market. In those early days, insurance was intrinsically coupled with the expansion of mercantilism, and exploration (and exploitation) of new sources of gold, silver, spices, furs and other precious goods - including slaves - from the New World. For these merchant adventurers, insurance was the "means whereof it comes to pass that upon the loss or perishing of any ship there followed not the undoing of any man, but the loss lighteth rather easily upon many than upon a few... whereby all merchants, especially those of the younger sort, are allured to venture more willingly and more freely."