What was possible of the many invention of the middle ages

The period saw major technological advances, including the adoption of gunpowder, the invention of vertical windmills, spectacles, mechanical clocks, and greatly improved water mills, building techniques (Gothic architecture, medieval castles), and agriculture in general (three-field crop rotation).

Crop irrigation, bathing and drinking water, fish for food, the reeds growing there furnished materials for building and paper. the river was also used for transportation.