Frederick William IV (1795-1861) was king of Prussia from 1840 to 1861. Perhaps the most intelligent and artistically talented Prussian monarch, he proved to be an erratic and unreliable leader during the German Revolution of 1848.

On Oct. 15, 1795, Frederick William IV was born in Berlin, the oldest son of Frederick William III. Educated by the preacher-statesman J. P. F. Ancillon, he devoted most of his energies as crown prince to the ardent study and patronage of the arts. F. K. von Savigny, F. W. J. von Schelling, K. F. Schinkel, A. W. von Schlegel, L. Tieck, L. von Ranke, A. von Humboldt, and other leaders of the romantic movement were among his closest friends.

Frederick William's ascension to the throne on June 7, 1840, was thus greeted with the expectation that he might help to realize the liberal-national aspirations of his distinguished friends. He soon alleviated press censorship and affirmed religious freedom for...