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Bearing in mind the historical evidence, it seems likely that the reservoirs of Aetius, Aspar and Mokios, along with all the other cisterns along the Thracian line, fell out of use between 626 and 765 when that line was cut and subsequently repaired… Mango points to an illustration in the tenth-century manuscript of Hero of Byzantium’s Geodesia, which shows the reservoir of Aspar filled with water.
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