In Prussia, King Frederick William IV dies and is succeeded by his
brother William l, who reigns until 1888, becoming the first German
Emperor.
Citation:
Editors. "Frederick William IV of Prussia dies".
The Literary Encyclopedia. First published 30 December 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=18403, accessed 19 May 2013.]