Kaiser-Wilhelmsland ("Emperor William's Land") formed part of German New Guinea (German: Deutsch-Neuguinea), the South Pacific protectorate of the German Empire. Named in honour of Wilhelm I, who reigned as German Emperor (Kaiser) from 1871 to 1888, it included the northern part of present-day Papua New Guinea. From 1884 until 1920 the territory was a protectorate (German: Schutzgebiet) of the German Empire. Kaiser-Wilhelmsland, the Bismarck Archipelago (including New Mecklenburg and New Pomerania), the northern Solomon Islands, the Caroline Islands, Palau, Nauru, the Northern Mariana Islands, and the Marshall Islands comprised German New Guinea.
Most of the German settlers in Kaiser-Wilhelmsland worked as plantation owners, miners, or government functionaries; the number of European settlers, including non-Germans, was never very high. In 1885, Lutheran and Catholic congregations sent clergy to establish missions; they experienced moderate, but very slow, success with the indigenous peoples. Missionaries and plantation owners alike were limited by tropical diseases and by travel and communication barriers.