Leonardo da Vinci's armored vehicle had a conical armored body and was intended to move using cranks.
Leonardo designed the fighting vehicle around 1487 while working in Milan for Ludovico Sforza. The machine was covered by a sloping, conical shell intended to deflect incoming weapons. Several light cannons were arranged around its lower edge so the vehicle could fire in different directions.
The design is frequently called Leonardo's tank, but that modern label can cause confusion. It was not a motorized tank in the twentieth-century sense: it had no engine, and its proposed movement depended on people turning internal cranks. A well-known drawing also contains a gearing problem that would prevent the original mechanism from moving as shown.
The vehicle was probably a military concept rather than a completed battlefield machine. Its significance comes from combining armor, all-round firepower, and protected crew space in one unusually ambitious Renaissance design.