Conversation so far:
how many football teams are there in france
The Ligue de Football Professionnel is responsible for the 46 professional football clubs that contest football in France.
what is the Ligue de Football Professionnel
The Ligue de Football Professionnel is a French governing body that runs the major professional football leagues in France.

Question: when did it start
Self-contained rewrite: when did the Ligue de Football Professionnel  start