The throne was in operation a century later , when Liutprand of Cremona witnessed it during his visit to Constantinople .
Leo also invented several automata , such as trees with moving birds , roaring lions , and a levitating imperial throne .
The throne was in operation a century later , when Liutprand of Cremona witnessed it during Leo 's visit to Constantinople .
Leo also invented several automata , such as trees with moving birds , roaring lions , and a levitating imperial throne .