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Source - http://fmg.ac/Projects/MedLands/POLAND.htm#Mariadied1454
This time the fight took place successfully for Siemowit IV: by the end of 1384 he could conquer Łęczyca. However, he soon realized that, given the power of the Polish-Lithuanian union (confirmed in the Union of Krewo), his forces are too small. Finally, he decided to make 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.[3][4][5][6][7]
Siemowit IV's final testimony of complete resignation over 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. After this, he joined the royal entourage to Vilnius, where he participated in the process of Christianization of Lithuania.
After finally admitted his defeat and paid homage to the Polish King, the political situation of Siemowit IV was significantly deteriorated. Before the war, as an independent ruler he can effectively maneuver between the Polish, Lithuanians and the Teutonic Order; now, as a vassal was clearly seen as an ally 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.[8] In order to maintain his friendly relations with the Teutonic Order, he provides them with refunds even during the campaign; in exchange, the Order returned Zawkrze to Siemowit IV, despite the fact that under the Peace of Thorn (1411) they aren't obliged to do it.
Despite his official subordination to Poland, Siemowit IV tried to pursue an independent foreign policy. This was expressed in his frequent contacts with the Hungarian King Sigismund, who, wishing to drag a Polish vassal to his side gave the Masovian Duke the rich prebends from the Bishopric of Veszprém and other possessions across Hungary.
Siemowit IV's relations with Poland, although some temporary frictions caused by his too independent policy (he even minted his own coins) remained friendly, despite the fact that he didn't fulfill his duties as a vassal, and only sent troops to Poland occasionally when he was required to do. Another gesture of friendship with King Władysław II was noted when he used Siemowit IV's daughters into political marriages and the support given to his son Alexander in his Church career.
In domestic politics, Siemowit IV continued the economic restructuring which begun under the rule of his father. For this purpose, in addition to the existing statutes he implemented the Kulm law in several of his cities and promoted the colonization of the Masovian nobility to Belz.
After 1420 Siemowit IV, due to his progressive blindness, gradually gave participation in the government to his adult sons. In 1425, the dispute about the election of his Chancellor Stanisław z Pawłowic as Bishop of Płock didn't brought anything good to Masovia, and only forced his sons Siemowit V and Casimir II into a humiliating surrender.
Siemowit IV died on 21 January 1426 at Gostynin and was buried in the Ducal crypt at Płock Cathedral.
==Division of Masovia (1381–1426)==
Siemowit IV (also known as Ziemowit IV) (b. ca. 1353/1356[1], d. January 21, 1426[2]) was one of the Dukes of Masovia. His domain included the lands of Czersk, Rawa, Sochaczew, Płock and Gostynin. In 1381 he inherited Wisz and in 1387 Bełz. Siemowit IV was a son of Siemowit III. After the death of Ludwik Węgierski he was one of the pretenders to the Polish throne. In 1383 he conquered Cuyavia, but was soon expelled by the joint forces of szlachta from Lesser Poland and armies of Hungary. In 1386 he accepted the rule of Grand Duke of Lithuania and King of Poland Jogaila and became a hereditary vassal of Poland. The following year he married the sister of the Polish king, Aleksandra, and received the land of Bełz.
He lost much of his domain to the Teutonic Order, including Wizna, Zawkrze and Płońsk. To get it back, he took part in the war of 1409–1410 between Poland, Lithuania and the Teutonic Order. During the Battle of Grunwald he fielded three banners of his own troops, fighting alongside the Poles.
1352 |
1352
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Czersk, Mazowieckie, Poland
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1387 |
1387
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1389 |
1389
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Sochaczew, Warszawa, Warszawa, Mazowia, Poland
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1390 |
1390
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Sochaczew, Warszawa, Warszawa, Mazowia, Poland
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1394 |
1394
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Sochaczew, Warszawa, Warszawa, Mazowia, Poland
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1395 |
1395
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Sochaczew, Warszawa, Warszawa, Mazowia, Poland
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1395
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Sochaczew, Warszawa, Warszawa, Mazowia, Poland
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1397 |
1397
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Sochaczew, Warszawa, Warszawa, Mazowia, Poland
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1399 |
1399
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Sochaczew, Warszawa, Warszawa, Mazowia, Poland
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