Leonardo da Vinci designed an armored vehicle with a rotating platform and multiple cannons.
The machine is commonly described as an early tank concept. Its conical, covered body was intended to protect the crew, while guns around the platform could fire in several directions. The vehicle was to be moved by internal cranks connected to wheels, keeping the operators sheltered inside.
Leonardo’s surviving drawing contains a famous mechanical problem: the crank arrangement appears to make the vehicle move in the wrong direction. Some historians have suggested this may have been deliberate, perhaps to conceal the design or expose a flaw to be corrected. Whatever the reason, the vehicle was never documented as a successful military machine.
Calling it a “tank” is convenient but retrospective. Modern tanks use engines, tracks, armor systems, and military technology unavailable to Leonardo. The historical invention is more precisely an armored fighting vehicle concept with a rotating gun platform.