The following is a chronological list of mayors of Hamburg, a city-state in Germany. The mayors are the head of the city-state, part of the government of Hamburg. Since 1861, according to the constitution of 28 September 1860, the state has been governed by the ten-member Senate, which had previously been called the council (in the German language of that time: Rath). It is headed by the First Mayor of Hamburg (German title: Erster Bürgermeister der Freien und Hansestadt Hamburg) as the President of the Senate. The deputy is the Second Mayor.