What Renaissance robot did Leonardo da Vinci design for a 1495 Milan celebration?

Leonardo da Vinci designed a mechanical knight for a 1495 celebration in Milan.

The machine was probably commissioned by Ludovico Sforza, Leonardo’s patron and the ruler of Milan. Leonardo’s notebooks show a human-shaped armored figure operated by a system of pulleys, cables, gears, and cranks. The mechanism could reportedly sit, stand, move its arms, and move its jaw.

The robot was not an electronic or autonomous machine in the modern sense. It was a mechanical automaton, meaning that its visible movements were produced by carefully arranged mechanical parts. Leonardo’s studies of human anatomy helped him think about how joints and limbs could be reproduced mechanically.

The original device has not survived, so details about its public performance remain uncertain. In the early 21st century, researchers reconstructed versions from Leonardo’s drawings. These reconstructions helped show that the design was mechanically plausible, even though it was created more than 400 years before modern robotics.