Salt Tax Revolt in the context of Gaspar de Guzmán, Count-Duke of Olivares

A salt tax refers to the direct taxation of salt, usually levied proportionately to the volume of salt purchased. The taxation of salt dates as far back as 300 BC, as salt has been a valuable good used for gifts and religious offerings at least since 6050 BC. As a result of the successful profitability of the salt tax, its use would diffuse among governments across the world. France, Spain, Russia, England, and India were the main regions to follow the Chinese lead. Salt was used as a currency during the Roman Empire, and towards the end of their reign the Romans began monopolising salt in order to fund their war objectives. Salt was such an important commodity during the Middle Ages that salt production facilities became some of the first state-owned enterprises. Salt is one of the longest standing sources of revenue for governments; the taxation policy was so successful due to the vital role of salt within the human diet. Salt taxes have been extremely influential in many of the political and economic revolts within history, resulting in important historic events including the French Revolution, the Moscow Salt Riot, the Salt March in India, and the Salt Tax Revolt in Spain.