Frankfurt, officially Frankfurt am, is a metropolis and the largest city of the German federal state of Hesse, and its 7.3 million (2016) inhabitants make it the fifth-largest city of Germany after Berlin, Hamburg, Munich, and Cologne.
Frankfurt is the largest city in the Rhine Franconian dialect. Frankfurt was a city state, the Free City of Frankfurt, for nearly five centuries, and was one of the most important cities of the Holy Roman Empire; it lost its sovereignty in 1866. The city is culturally and ethnically diverse, with around half of the population, and a majority of young people, having a migration background. A quarter of the population are foreign nationals, including many expatriates.