The water mills Janiculum
the aurelian walls continued hill emperor aurelian (reigned ad 270–275) include water mills used grind grain provide bread flour city. mills supplied aqueduct, plunged down steep hill. site resembles barbegal, although excavations in late 1990s suggest may have been undershot rather overshot in design. mills in use in ad 537, when goths besieging city cut off water supply. later restored , may have remained in operation until @ least time of pope gregory iv (827–844).
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