page_title: Clan Ostoja
section_title: Stibor of Poniec
hierarchical_section_title: Clan Ostoja / Chronology / Late medieval period / Stibor of Poniec
caption_attribution_description: English: Malbork in Poland - former Teutonic Knights Castle Marienburg - panorama
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: The great diplomatic work achieved by Stibor and Mikolaj was to be continued by Stibor of Poniec some 50 years later. He raised funds in Gdańsk (Danzig) for a campaign against the Teutonic Knights who held Malbork (Marieburg). The Teutonic Knights had financial difficulties at this time and were in great debt to the bulk of their main defensive force which consisted of Czech/Moravian mercenaries. Using the money from Gdańsk, Stibor de Poniec was able to persuade the mercenaries to leave the stronghold and he took control of Malbork without battle; King Casimir IV Jagiellon entered the castle in 1457. This led to the Second Treaty of Thorn, sealed in 1466 by Sibor of Poniec. Furthermore, he negotiated on behalf of the Polish king with Denmark which had supported the Teutonic Knights, and succeeded in ending a Danish blockade on Polish commerce in the Baltic Sea. Other members of the Clan of Ostoja were also recognized as formidable knights in the conflict against the Teutonic Order.
caption: Malbork (Marienburg), Teutonic Knight stronghold captured by Stibor de Poniec of Ostoja
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