Janiculum Hill Watermills

• The Watermills on the Janiculum Hill were fed by an Aqueduct that ran downhill. The wheels are thought to have been turned by the undershot method. They ground the grain for Rome.
• The watermills were there when the Aurelian Walls were built to include them in 275 CE, and they were still in use during the Gothic Siege of 537 CE and may have continued working up until the 9th century CE.

Janiculum Hill, Rome