When did Comte Mede de Sivrac think about the bicycle?

Comte Mede de Sivrac is often credited with inventing a precursor to the modern bicycle in the late 18th century, around 1791. His invention, known as the "celerifere," was a wooden, two-wheeled vehicle without pedals, which riders propelled by pushing their feet against the ground. Although it did not feature the mechanical advancements of later bicycles, it laid the groundwork for future developments in cycling technology.