Short answer
Yes. Leonardo da Vinci's notebooks contain fragmentary designs for an armored mechanical figure, usually dated to about 1495, that could sit up, move its arms and open its visor using pulleys, cables and gears. Whether Leonardo actually built and showed it in his lifetime is not known for certain.
Follow-up question Was the mechanical knight ever built, and does it work?
Among the thousands of pages Leonardo da Vinci filled with notes and drawings are sketches for a figure in armor that moves on its own. Modern researchers call it Leonardo's mechanical knight, or Leonardo's robot. Pieced together from scattered drawings of gears, pulleys and cables, it appears to describe a knight that could sit up, raise and lower its arms, and lift its visor.
Nothing of the knight survives except those drawings and the models people have built from them. Even so, it has become one of the best-known early examples of a human-shaped machine.
When and where it was designed
Leonardo spent a long stretch of his career in Milan, working for its ruler, Ludovico Sforza. Scholars usually date the knight to around 1495, during those Milan years. The story that Leonardo presented the finished machine at a celebration at Sforza's court is widely repeated, but it rests on tradition rather than a firm document. The scholar Anne Pasek, writing about the knight in 2014, puts it carefully: the knight is suspected to have been built in 1495 under Sforza's patronage.
The designs are scattered across Leonardo's notebooks, especially the large collection of his papers known as the Codex Atlanticus. They were recognized as parts of a single humanoid machine only in the 1950s, when scholars began to study what certain technical drawings actually showed.
Who brought it back to light
Two names stand out in the modern story. Carlo Pedretti, a leading Leonardo scholar, studied the drawings and helped identify their purpose. Mark Elling Rosheim, a roboticist, worked with Pedretti to reconstruct the machine, combining the surviving sketches with his own engineering judgment to fill the gaps. Pedretti called it "the first articulated humanoid robot in the history of Western Civilization."
That word "reconstruct" matters. Leonardo did not leave a finished blueprint. Every working model involves choices about how the fragments fit together, so different builders have produced somewhat different knights.
How the knight was meant to work
The knight is essentially a puppet with its strings on the inside. Based on the reconstruction Pasek describes:
| Part | How it moves |
|---|---|
| Outer shell | A suit of armor, in German-Italian style, hides the machinery. |
| Arms and wrists | A worm gear (a screw that turns a toothed wheel) and a rotating drum with cams (shaped bumps) in the chest drive the arms, with four degrees of freedom. |
| Legs | An external crank and a system of cables move the legs, with three degrees of freedom. |
| Head | The visor can open and close. |
| Coordination | The parts are linked so they move together in one smooth action rather than independently. |
A "degree of freedom" is one independent way a joint can move, such as bending an elbow or turning a wrist. Modern robot arms are often described by how many they have.
Pasek describes the effect as dramatic: activated, the knight would rise upright while closing its arms in front of its chest, an embrace that might well have startled Sforza's guests.
Try it: Find a desk lamp with hinged arms, or a pair of kitchen tongs, and count its degrees of freedom: each separate way it can bend or turn. Then count your own arm's, from shoulder to fingers. The gap shows why building humanlike machines is hard.
Why it matters for AI in 2019
Leonardo's knight is not artificial intelligence. It could not see, decide or learn. Its value lies elsewhere.
First, it treats the human body as something that can be studied as a machine. Leonardo's drawings of muscles and joints and his drawings of gears and pulleys come from the same curiosity. That habit of comparing bodies and machines runs straight through to robotics today.
Second, the rotating drum with cams is a way of storing a sequence of movements in a physical part. Pasek calls it an analogue programmer. Change the shape of the cams and you change the motion. It is the same basic idea found in the pegged drums of earlier automata and in music boxes, and an ancestor of the idea of a program.
Third, it reminds us how much intelligence it takes simply to move like a person. In 2019, robots can do backflips in demonstration videos, yet everyday tasks like folding laundry or walking on rough ground remain hard research problems. Leonardo was working on the easiest part of the puzzle, the mechanics, and even that required genius.
Was the mechanical knight ever built, and does it work?
No original knight has ever been found, and no document from Leonardo's time proves that one was finished. The best we can say is that the drawings show a serious, detailed design, and that Leonardo had the skill and the patron to build it.
In modern times, several people have built working versions. Rosheim's reconstruction with Pedretti showed that the design could move as intended, and in 2007 the Leonardo3 research center in Milan built another model. Models based on the design are also shown in museums, including one with its inner workings on display in Berlin.
Those models prove that the mechanism can work, not that Leonardo's own version did. For a beginner, that distinction is a useful habit to take into any discussion of technology, old or new: separate what a design could do from what was actually built and shown to work.
Sources
- Renaissance Robotics: Leonardo da Vinci's Lost Knight and Enlivened Materiality — Anne Pasek, Shift: Graduate Journal of Visual and Material Culture, Issue 7, November 1, 2014
- Leonardo's robot — Wikipedia (archived January 2019), January 30, 2019