What machine did Leonardo da Vinci design with a humanoid armored figure inside?

Leonardo da Vinci designed a robotic knight, a humanoid machine enclosed in armor.

Leonardo’s notes and drawings from around 1495 show a mechanical knight created for a festival or court spectacle in Milan. The figure was designed to sit, stand, raise its arms, and move its head and jaw through a system of pulleys, cables, and gears. Its outer appearance resembled a German-Italian medieval armored warrior.

The design was hidden for centuries in Leonardo’s technical papers. In the 20th century, researchers reconstructed the mechanism from his drawings and found that the concept could produce the movements described. The reconstructed machine is often called Leonardo’s robot, although “robot” is a modern term and was not used by Leonardo.

This invention was not an electronic robot or an autonomous artificial-intelligence system. It was a mechanical automaton operated by stored or transmitted force. Its importance lies in the way Leonardo combined anatomical observation, theatrical design, and engineering into a moving human-shaped machine.