I don't believe it was ever truly discovered. It has its roots in the latin brought by the Romans when they invaded in 59 AD. The germanic tribes that invaded after the fall of the empire brought their own languages that influenced the language already present.
No one 'discovered' the French language. As with all others it evolved.
French is derived (based off of) from Latin; it is a Romance Language.
Kathryn L. O'Brien has written: 'Second-year French' -- subject(s): French language, Grammar 'First-year French' -- subject(s): French language, Grammar 'New second-year French' -- subject(s): French language, Grammar, Lending library
The Rosetta Stone, which held hieroglyphs, was discovered in 1799 by French Soldiers.
Fuligo septica was discovered in 1727 by Jean Marchent, a French botanist.
French toast was mentioned in a collection of Latin receipts in the 4th and 5th centuries
Asprin was first discovered by a French Chemist named Charles Frederic Gerhardt in the year 1853, but it was not called aspirin until 1899.
La Reunion is a French overseas department, so French is the official language. This is because La Reunion has been a French territory since the 17th century and was colonized by the French. French language and culture have been influential in shaping the identity of the island.
French was not "discovered" since no language (aside from made-up ones like Klingon and Esperanto) comes into existence instantly. What we call French today has its roots in the dialects of Latin spoken in North Central France near what is today Paris in the 1300s and 1400s. Intermediate dialects of Latin that slowly become French existed for nearly 1000 years prior to this.
In the year 1066, Old English was the primary language spoken in England. Norman French was also used by the ruling elite after the Norman Conquest.
The Rosetta Stone, discovered in 1799 near Alexandria, was the key to hieroglyphics.
Helium was discovered in 1868 by French astronomer Jules Janssen during a solar eclipse while observing the sun's spectrum.