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, as a site of Imperial coronations; it lost its sovereignty upon the collapse of the empire in 1806, regained it in 1815 and then lost it again in 1866, when it was annexed (though neutral) by the Kingdom of Prussia.
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The Free City of Danzig (German: Freie Stadt Danzig; Polish: Wolne Miasto Gdańsk; Kashubian: Wòlny Gard Gduńsk) was a German city-state under the protection of the League of Nations between 1920 and 1939, consisting of the Baltic Sea port of Danzig (now Gdańsk, Poland) and nearly 200 other small localities in the surrounding areas.
After more than 600 years as a Free City, Frankfurt am Main was annexed to Prussia in 1866 With the rise of Revolutionary France in Europe, this trend accelerated enormously. After 1795, the areas west of the Rhine were annexed to France by the revolutionary armies, suppressing the independence of Imperial Cities as diverse as Cologne, Aachen, Speyer and Worms.
History of free will. The problem of free will has been identified in ancient Greek philosophical literature. The notion of compatibilist free will has been attributed to both Aristotle (fourth century BCE) and Epictetus (1st century CE); "it was the fact that nothing hindered us from doing or choosing something that made us have control over them".
In the Holy Roman Empire, beginning in the 12th century, free imperial cities such as Nuremberg, Strasbourg, Frankfurt, Basel, Zurich, Nijmegen became a privileged elite among towns having won self-governance from their local lord or having been granted self-governanace by the emperor and being placed under his immediate protection.
The Frankfurt am Main tramway network is a network of tramways forming a major part of the public transport system in Frankfurt am Main, a city in the federal state of Hesse, Germany. As of 2012 [update] , there were 10 tram lines,  along with two special lines [ citation needed ] and one heritage tourist tramline .