Article L4133-3 of the French General Code of Local Authorities
The functions of president of a regional council are incompatible with the exercise of one of the following elective functions: president of a departmental council, mayor, the president of the council of the metropolis of Lyon. The duties of president of a regional council are also incompatible with those of member of the European Commission, member of the executive board of the European Central Bank or member of the monetary…