page_title: Clan Ostoja
section_title: Stibor of Stiboricz and Sigismund von Luxemburg
hierarchical_section_title: Clan Ostoja / Chronology / Late medieval period / Stibor of Stiboricz and Sigismund von Luxemburg
caption_attribution_description: Deutsch: Holy Roman Empire in the 14th century. Deutsch: Das Heilige Römische Reich im 14. Jahrhundert.
context_page_description: Clan Ostoja was a powerful group of knights and lords in late-medieval Europe. The Clan encompass families in the Polish-Lithuanian Commonwealth, Upper Hungary, Hungary, Transylvania, Belarus, Ukraine, and Prussia. The Clan crest is the Ostoja coat of arms, and the battle cry is Ostoja or Hostoja. The Clan adopted the Royal-Sarmatian tamga draco emblem.
  During the Polish-Lithuanian Commonwealth, the Clan adopted several Lithuanian and Belarusian families, generally of Ruthenian princely origin, and transformed into a Clan of landlords, senators and nobility. Members of the Clan worked together closely, often living close to each other. They held high positions, and held a great amount of land and properties in both Commonwealth and in Upper Hungary in medieval times, including many great gothic style castles. Members of the Clan of Ostoja ruled several feudal lordships in Upper Hungary between 1390 and 1434 and Transylvania in 1395-1401 and again in 1410-1414, during the time of Duke Stibor of Stiboricz.
context_section_description: Stibor of Stiboricz (1347–1414) of the Clan of Ostoja, son of Moscic Stiboricz (Duke of Gniewkowo), held the position of Lord of regality (Starosta) of Brzesc as he also served Louis I of Hungary but when the King died, he lost the position as Starost of Brzesk because of his support the House of Anjou and left Poland for Hungary. Although Stibor received office of Lord of the regality (Starost) of Kuyavia in 1383, he turned to help his friend Sigismund von Luxemburg (later Sigismund, Holy Roman Emperor) on Hungarian throne 1386 and become his most loyal ally.
  Sigismund was the Prince of Brandenburg before rising to the Hungarian throne. He later became Holy Roman Emperor, King of Germany, Bohemia, Hungary (including present-day Slovakia, Balkan states, Romanian and Bulgarian lands), Italian republics and Prince of Luxembourg. At the age of 13, he was sent to Krakow in order to study Polish language and customs. He married Mary, daughter of Louis the Great and became one of the most powerful Emperors in Europe.
  In Poland, as Stibor of Stiboricz recognized the competitors of Jogaila on Polish throne, he immediately entered Poland with an army of 12,000 men, commanded by Sigismund von Luxemburg, to assure that younger sister of Mary, Queen of Hungary, would mary Ladislaus Jogaila and end the battle for Polish Crown. 1384 Jadwiga was Crowned as Queen of Poland and in 1386 Jogaila married her and became King of Poland.
  Sigismund recognized Stibor of Stiboricz as his most loyal friend and adviser. In 1387 he granted Stibor the position as Master of Hungarian Court and also the Governor of Galicia (Eastern Europe). The King gave also Stibor the exclusive right to receive high offices in the Empire. In 1395, Stibor became Duke of Transylvania, a nomination that made him lord of almost half of Romania of today.
  In 1396 Sigismund led the combined armies of Christendom against the Ottoman Empire. The Christians were defeated at the Battle of Nicopolis. Stibor of Stiboricz, one of the generals and commanders of the army, rescued Sigismund, who was in great danger while retreating from the battlefield.
  In May 1410, King Sigismund entrusted Stibor and the Palatine Nicholas II Garay to mediate between the Teutonic Knights and King Władysław II of Poland, but when negotiations failed, war broke out. The Battle of Grunwald took place, with almost all of the Ostojas leaving Hungary to join Polish forces. At the end of 1411, Stibor, his brothers and other members of the Clan of Ostoja was in charge of leading troops to fight against the Venetian Republic in Friuli. In 1412 Stibor was meeting with Zawisza Czarny (The Black Knight) in his Castle of Stará Ľubovňa in Slovakia, preparing the negotiation between Sigismund and Polish King Vladislav Jogaila, which ended with the Treaty of Lubowla.
  Stibor proved to be a great diplomat who combined loyalty to King Sigismund with his diplomatic work on behalf of Poland. In  1397 Sigismund chose Stibor as his representative in negotiations with the Polish King Jogaila, who appointed Mikolaj Bydgoski to represent Polish Crown. Thus the two brothers, Stibor and Mikolaj, met as leaders of their respective diplomatic delegations. Later on, around  1409, King Jogaila appointed his most trusted diplomat Mikołaj Błociszewski of the Clan of Ostoja to lead the negotiations.
  In the end, it was the Clan of Ostoja that was the leading force in breaking down Teutonic side, they did it not only by using fine art of sword but also with outstanding diplomatic skills.
caption: Houses of Habsburg and Luxenburg in the Holy Roman Empire, 1273-1378
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