It was administered with New East Prussia from 1795 onwards, until in 1807 it became part of the Napoleonic Duchy of Warsaw according to the Treaties of Tilsit.
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While the western part of the voivodeship had already been annexed by Prussia in the course of the First Partition of Poland in 1772, Dobrzyń Land on the eastern banks of the Vistula was incorporated into South Prussia during the Second Partition in 1793.
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After grandfather's death in 1370, young Casimir initially became his partial successor, as the last will gave him lands of Dobrzyń, Bydgoszcz, Kruszwica, Złotów and Wałcz as fiefs.
Peace of Raciąż was a treaty signed on 22 May 1404 between Kingdom of Poland, Grand Duchy of Lithuania, and the Teutonic Knights, regarding the control of the Dobrzyń Land and Samogitia.
The Dobrzyn Land was divided into three counties (Dobrzyń, Rypin, Lipno), and had its own sejmiks at Lipno.
The final treaty was signed in Raciąż and addressed some of the territories disputed between Poland, Lithuania and the Order: the Dobrzyń Land was to return to Poland for a fee, Samogitia was to remain with the Order, and the discussion regarding the Gdańsk (Danzig) region was inconclusive.