Prince-Bishopric of Warmia
The government region was created on 1 November 1905 as the third East Prussian "Regierungsbezirk" out of the southern districts of the two original administrative regions Gumbinnen and Königsberg, which had been established in 1815. It comprised the south of the former Duchy of Prussia; the lands of the Allenstein and Rößel districts had belonged to the Prince-Bishopric of Warmia, annexed by Prussia in 1772. In 1920 1920 East Prussian plebiscite all the Allenstein Region plus the was part of the Allenstein Plebiscite precinct, with the electorate voting for remaining with Germany by more than 97%.