http://www.saltworks.us/salt_info/si_HistoryOfSalt.asp:History Of Salt

As far back as 6050 BC, salt has been an important and integral part of the world’s history, as it has been interwoven into the daily lives of countless historic civilizations. Used as a part of Egyptian religious offerings and valuable trade between the Phoenicians and their Mediterranean empire, salt and history have been inextricably intertwined for millennia, with great importance placed on salt by many different races and cultures of people. Even today, the history of salt touches our daily lives. The word “salary” was derived from the word “salt.” Salt was highly valued and its production was legally restricted in ancient times, so it was historically used as a method of trade and currency. The word “salad” also originated from “salt,” and began with the early Romans salting their leafy greens and vegetables. Undeniably, the history of salt is both broad ranging and unique, leaving its indelible mark in cultures across the globe.