a different tactic: if it was impossible for him obtain the crown, he decided to win all the territory possible. Reconciliation with opponents Siewomit, after adding Łęczyca to his territory, decided to undertake peace negotiations with Jadwiga, which ended successfully on 12 December 1385 with the signing of a treaty, under which Siemowit IV returned all the lands taken by him in exchange for the sum of 10,000 silver marks, and most important, he relinquished all his claims to the Polish crown and paid homage to the Queen Jadwiga and her new husband and King, Jogaila, from which he received the Duchy of Belz as dowry of Princess Alexandra of Lithuania, Jogaila's sister, who married Siemowit IV as a gesture of reconciliation between both parties. Siemowit IV's complete resignation of his claim to the Polish crown was his attendance to the ceremonies of baptism, marriage and coronation of Jadwiga and Jogaila in Kraków. After these ceremonies, he renewed his homage to the royal couple. He joined the royal entourage to Vilnius, where he participated in the process of Christianization of Lithuania. Post civil war activity Before the war, as an independent ruler he could effectively maneuver between the Polish, Lithuanians and the Teutonic Order; now, as a vassal was clearly seen as a representative of the Polish Kingdom. In addition, in order to finance his policies he needed money and several times he mortgaged some of his domains to the Teutonic Order, including Wizna (during 1382-1401), Płońsk (during 1384-1399) and Zawkrze (during 1384-1399 and 1407-1411). In view of the growing friction between the Polish and Teutonic Order, Siemowit IV tried to obtain the greatest benefit for him and intervened as a mediator. Also, after the outbreak of the war of 1409–1410 between Poland, Lithuania and the Teutonic Order, the attitude of the Masovian Duke wasn't clear: in one side, he tried to contact King Sigismund of Hungary and by other side, he pressured his warring neighbors to maintain the peace. In view of the failure of his attempts to make a compromise, Siemowit IV finally sent his troops at the Battle of Grunwald, but his participation was only symbolic; in fact, was his son Siemovit V who fielded two banners of his own troops and fought alongside the 'Royal' Poles and Lithuanian troops. In order to maintain his friendly relations with the Teutonic Order, he provides them with refunds even