In part it describes impractical experiments. This includes the first clear medieval depiction of an Archimedean screw, but also the oldest known drawing of a chastity belt. Some of the devices are illustrated for the first time in Kyeser's handwriting. The devices are technically not always correctly reproduced, but with devices that he was familiar with from his own experience, Kyeser sometimes achieved an extraordinary wealth of detail. The Bellifortis summarizes, in the form of a manual, machines and devices, especially for war purposes, which the author was familiar with from ancient texts or his own experience. Banished beggars by Sigismund to the castle, he began to write his Bellifortis. In 1402 he was at the court of King Wenceslas. Since 1394 he took part in the crusades of King Sigismund of Hungary against the Ottomans, for the failure of which he blames Sigismund in his Bellifortis. There he not only gained war experience, but also came into contact with Italian Renaissance humanism. In 1389 he moved to Italy with a Bavarian mercenary army. He studied medicine in the Dominican monastery there. Konrad Kyeser came from a middle-class family from Eichstätt. Manuscript Rome, Biblioteca Apostolica Vaticana, Vaticanus Palatinus lat. Device for forcibly removing a drawbridge in Bellifortis.
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