The total number of émigrés is now estimated rather elastically at anywhere from 100,000 to 250,000. Whatever their number, their value to France’s opponents was immediately recognized by Protestant states. Holland granted them rights of citizenship at once and exemption from taxes for three years. Frederick William, Elector of Brandenburg (the future Prussia), issued a decree within a week of the Revocation inviting the Huguenots into his territory where their industrial enterprise contributed greatly to the rise of Berlin.