In the 12th century, knights from Malta built an artificial channel in Prague Kampa which is today called Certovka (The Devil´s Stream). After the floods of 2002, some accumulated garbage needed to be removed from Certovka and as a result, the mill wheel (Velkopřevorský Mlyn) spins again starting from 2 September 2009. It took over two months to clean and reconstruct Certovka at the costs of 21.5 million crowns.

The mill wheel used to power a mill inside the adjacent house, it belonged originally to Johannite monastery and Knights of Malta. Their church and monastery was established by Vladislav I. Hussites destroyed the monastery and the church and all the farm houses. Among the major owners of the mill was the miller Stephen and his wife Catherine from year 1526, after that, the mill was named after them “Stepanovsky” for quite a long time.

Later the mill was acquired by the Lesser Town, which rebuilt it in a Renaissance style between1597 and 1598 and then in a Baroque style.
The building survived many floods, but the worst was when it was damaged by a fire in 1938. The former owner of the mill Mr Sebek used it as a feathers laundry where some machines powered the mill wheel.
Later the mill was totally suspended because in an adjacent building were flats. The wheel was renewed several times till this year’s reconstruction when you will see the romantic mill spinning again.