The German publisher and chairman of the German Publishers and Booksellers Association (Börsenverein des Deutschen Buchhandels), Gustav Adolf von Kröner (1836–1911) campaigned for fixed book prices; this was instituted in the course of the "Kröner reform" of 1886/1887 named after him.
Gustav Adolf von Kröner, black and white photograph, undated (c. 1900), photographer unknown; source: Wikimedia Commons http://commons.wikimedia.org/wiki/File:Adolf_Kroener.jpg, public domain.