The Treaty of Merseburg of 1033 was an agreement between the Salian Holy Roman Emperor Conrad II and the Piast king of Poland Mieszko II Lambert, settling the question of Polish succession which had been contested between Mieszko Lambert and his half-brothers Bezprym, Otto, and Dytryk, since the death of Bolesław I the Brave. Poland was divided into three parts with Mieszko Lambert designated as the supreme ruler. In exchange for the Emperor's support however, Mieszko was forced to renounce the title of king, which had been acquired in 1025 by his father and give up control over Lusatia and Upper Lusatia. Soon after the treaty was concluded, however, Otto died of natural causes and Mieszko prevented Dietric from assuming power in his portion of the divided Poland. Mieszko also subsequently continued to use the title of king until his death shortly after the treaty in 1034.