Piotr Dunin was a Polish

Kingdom of Poland (1385–1569)

The Kingdom of Poland of the Jagiellons was the Polish state created by the accession of Jogaila , Grand Duke of Lithuania, to the Polish throne in 1386. The Union of Krewo or Krėva Act, united Poland and Lithuania under the rule of a single monarch...

 leader. Starost of Malbork

Malbork

Malbork is a town in northern Poland in the Żuławy region , with 38,478 inhabitants . Situated in the Pomeranian Voivodeship since 1999, it was previously assigned to Elbląg Voivodeship...

 1478–1484, castellan

Castellan

A castellan was the governor or captain of a castle. The word stems from the Latin Castellanus, derived from castellum "castle". Also known as a constable.-Duties:...

 of Sieradz

Sieradz

Sieradz is a town on the Warta river in central Poland with 44,326 inhabitants . It is situated in the Łódź Voivodship , but was previously the eponymous capital of the Sieradz Voivodship , and historically one of the minor duchies in Greater Poland.It is one of the oldest towns in Poland,...

 from 1478, voivode of Brześć Kujawski Voivodeship

Brzesc Kujawski Voivodeship

Brześć Kujawski Voivodeship was a unit of administrative division and local government in Poland from 14th century to the partitions of Poland in 1772–1795...

 from 1481.

On September 17, 1462 he led the Polish army to victory over the Teutonic Knights

Teutonic Knights

The Order of Brothers of the German House of Saint Mary in Jerusalem , commonly the Teutonic Order , is a German medieval military order, in modern times a purely religious Catholic order...

 in the Battle of Świecino

Battle of Swiecino

The Battle of Świecino also called the Battle of Żarnowiec or in German Battle of Schwetz, took place on September 17, 1462 during the Thirteen Years' War...

 at Malbork castle

Malbork Castle

The Marienburg Castle in Malbork is by area the largest castle in the world. It was built in Prussia by the Teutonic Knights, a German Roman Catholic religious order of crusaders, in a form of an Ordensburg fortress. The Order named it Marienburg...

. This Thirteen Years' War defeat brought an end to Teutonic control of the region, as the Knights never recovered from it and those that followed.