The French Championships tennis tournament began in 1891 but women's doubles didn't make an appearance until 1907. The tournament was open only to French citizens and permanent residents through 1924, but beginning in 1925, the French Championships became an international event open to all nationalities.
If the doubles partners are from the same country then that country gets two titles instead of one, while if they are from different countries then each country will get one title apiece.
French Open other competitions
Grand Slam women's doubles