@Ionus,
Wine was imported into Gaul from Italy and Spain as early as the Etruscans, and from the early Greek settlements some areas began producing wine . It was always a major import and a very expensive one at that . Some Gallic tribes banned the import and consumption of wine, others buried their leaders with enormous quantities of it . One of the reasons Caesar went into Gaul was all the gold coming out to pay for wine, amongst other things .
When the Romans settled towns in Gaul, they brought the wine makers with them and Gaul ceased to be a major importer . Areas such as Bordeaux, Burgundy, Alsace, Champagne, Languedoc, Loire Valley and the Rhone became major producers during this time .
As late as the High Middle Ages some of the famous modern wine producing areas were still being settled . Monasteries not only found and settled wine areas but were also given some of the best areas . Areas near a river or sea port produced the most wines because they could sell the most . Some areas like Burgundy suffered because of a lack of water transport during this period .