Wine is one of 31 Rare Resources in the game and, if present on a map, available from the beginning. It appears as a small vineyard with green vines and several stakes (so called 'trellis'). Like all rare resources on land, Wine can be gathered by sending a Merchant from the Market to the resource location. Wine provides the following benefits to the nation:main article. Also note, that Knowledge is not gathered before the Classical Age, with one exception: The Greeks may gather Knowledge from the beginning, making an early exploitation of this resource more useful.The cost reduction affects all unit upgrades at the Barracks, Stable, Siege Factory, Dock, Airbase and Missile Silo, but it has no effect on the upgrade cost for Generals/Spies at the Fort. It is also cumulative with cost reduction bonuses granted from resources like Salt, Horses, or Sulphur.
There are many differences between wine and other alcoholic brews, most notably in the content of sugar and alcohol of the drink in question. It is thought that viticulture - the practice and study of producing wine from the very first sapling all the way to the last drop brewed - first took place in Western Asia, before being spread westward by Phoenician and Greek colonists throughout Europe and Africa.
Viticulture experienced an even greater perfusion throughout Europe in the Middle Ages with vineyards appearing throughout Iberia, France and Germany as well as Italy. Not all people enjoyed wine however: for those who could not access grapevines, wine remained a luxury of the nobility even as it was required in Catholic religious services. Japanese and Chinese preferred rice liquor, the Mongols were known for koumiss which was made from fermented mare's milk...whereas in the Islamic Middle East, the consumption of any liquor was considered haram and thus frowned upon.