Leonardo possibly started sketching ideas for his robot before he began work on
The Last Supper. Though no complete drawings of the automaton survived, Leonardo's notes suggest he may have constructed a prototype around 1495, while he was under the patronage of
Ludovico Sforza, the Duke of Milan. Before Leonardo designed his mechanical knight, eyewitness accounts detail how he created a mechanical lion that could move independently of human intervention. The mechanical lion was displayed in many public venues including the wedding of
Maria de Medici and at the arrival of the French King
Francis I in
Lyon in 1515. laboratories, in 2007 == Design ==