However , in 1242 , during the war of Emperor Frederick II against the Pope , the Archbishop of Mainz , Siegfried III , ordered the city 's destruction .
In 1232 Wiesbaden became a Reichsstadt , an imperial city , of the Holy Roman Empire .
In 1242 , during the war of Emperor Frederick II against the Pope , the Archbishop of Mainz , Siegfried III , ordered the city 's destruction .
In 1232 Wiesbaden became a Reichsstadt , an imperial city , of the Holy Roman Empire .