In 1285 Floris V, Count of Holland dammed the Hollandse IJssel connection between the Lek and the Hollandse IJssel.
Alphen aan den Rijn | Vaartse Rijn | ''The Conspiracy of Julius Civilis'', completed in 1661 by Rembrandt Harmenszoon van Rijn | Millingen aan de Rijn | John Muddiman explaining ''The Supper at Emmaus'' by Rembrandt van Rijn |
He had also had a dam laid down at Wijk bij Duurstede to stabilize the water level of the Kromme Rijn, and he had the Vaartse Rijn, a short canal, dug to improve the ship transportation.