Assertion: empire's emperor | /r/CapableOf | sit on hydraulic throne
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text: The Byzantines knew and used the concept of hydraulics: in the 900s the diplomat Liutprand of Cremona, when visiting the Byzantine emperor, explained that he saw the emperor sitting on a hydraulic throne and that it was "made in such a cunning manner that at one moment it was down on the ground, while at another it rose higher and was seen to be up in the air".