Wine was really important in the 15th Century. Fresh water supply was not always available and this was especially true if a castle was under siege. Each castle we visited had a large wine cellar. At Marksburg Castle it was on the ground floor near the stable. While these barrels are huge they aret not as large as the one in Heidelberg Castle which is thought to be the largest wine barrel in the world and almost impossible to photograph.
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Oh yes and in medieval times the water could not be trusted as clean, so beer and wine were invented we suppose!