Brutus de Villeroi (1794–1874) was a French engineer of the 19th century, born as Brutus Villeroi (he added the aristocratic "de" in his later years) in the city of Tours and soon moved to Nantes, who developed some of the first operational submarines, and the first submarine of the United States Navy, the Alligator in 1862.
In 1833, de Villeroi completed a small submarine, possibly named "Nautilus" in reference to the 1800 submarine created by Robert Fulton.
The submarine was 10' 6" long by 27" high by 25" wide and displaced about six tons when submerged. She was equipped with eight dead-lights on top to provide interior light, and a top hatch with a retractable conning tower for surface navigation. For propulsion, she had three sets of duck-foot paddles and a large rudder. She was also equipped with a hatches with leather seals in order to make some manipulations outside of hull, a small ballast system with a lever and piston, and a 50 lb anchor. The ship had a complement of three men.
This submarine was demonstrated at Fromentine, Noirmoutier, near Nantes, France, in 1833, and later to representatives of the Kingdom of the Netherlands in 1837.