Excerpts from Books and Wikipedia
"The Edict of Fontainebleau revoked all the privileges that Louis's grandfather Henry IV had granted to Protestants (Huguenots) in the edict of Nantes in 1598. It ordered Huguenot ministers to be banished, schools closed, places of worship destroyed, and children born to Huguenot parents baptized as Catholics. . . . Although the Edict of Fontainebleau formally denied Huguenots permission to leave France, between 200,000 and 500,000 (about half the total number of Protestants) fled the country." [Furtado: 1001 Days] "In his Memoirs of the House of Brandenburg, Frederick wrote that the revocation of the Edict of Nantes by Louis XIV in 1685, which removed the limited freedom of worship enjoyed by Protestants, had led to the emigration of 400,000 of France’s most enterprising and wealthy subjects. The majority went to Great Britain and the Dutch Republic, thus strengthening what proved to be Louis’s two greatest enemies, and 20,000 went to Brandenburg, which they thus helped to repopulate." [Blanning: Frederick the Great, Kindle, p. 407]