Frederick William IV of Prussia

Frederick William IV (German: Friedrich Wilhelm IV.; 15 October 1795 – 2 January 1861), the eldest son and successor of Frederick William III of Prussia, reigned as King of Prussia from 1840 to 1861. Also referred to as the "romanticist on the throne", he is best remembered for the many buildings he had constructed in Berlin and Potsdam, as well as for the completion of the Gothic Cologne cathedral. In politics, he was a conservative, and in 1849 he rejected the title of German Emperor offered to him by the Frankfurt parliament, considering that it was not in the parliament's gift. In 1857, he suffered a stroke, and was left incapacitated, until his death.

• http://en.wikipedia.org/wiki/Frederick William IV of Prussia