What automatic machine did Leonardo da Vinci design in human form for theatrical or courtly display?

Leonardo da Vinci designed a mechanical knight in human form for theatrical or courtly display.

The automaton was designed around 1495, probably for a pageant at the court of Ludovico Sforza in Milan. Leonardo's drawings show an armored figure powered by an internal system of pulleys, cables, and gears. The mechanism could imitate human actions such as sitting, standing, moving its arms, and raising its visor.

The original machine has not survived, so its exact capabilities remain uncertain. In the 1950s, researchers discovered relevant drawings in the Codex Madrid and used them to reconstruct the robot. Modern reconstructions demonstrate that the mechanism could move, but they should not be treated as proof that every motion in later popular descriptions was part of the original.