| Conventional Long Name: | Duchy of Oświęcim |
| Common Name: | Oswiecim, Duchy |
| Era: | Middle Ages |
| Status: | Silesian duchy |
| Year Start: | 1315 |
| Year End: | 1564 |
| Event Start: | Partitioned from Cieszyn |
| Event1: | Vassalized by Bohemia |
| Date Event1: | 1327 |
| Event2: | Split off Zator |
| Date Event2: | 1445 |
| Event3: | Sold to Poland |
| Date Event3: | 1457 |
| Event End: | Incorporated into Kraków Voivodeship |
| Event Post: | Seized by Austria |
| Date Post: | 1772 |
| P1: | Duchy of Teschen |
| Flag P1: | Flag of Cieszyn Silesia.svg |
| S1: | Crown of the Kingdom of Poland |
| Flag S1: | Banner of Sigismund III Vasa.svg |
| Border S1: | no |
| Image Map Caption: | Silesian duchies in 1309–11, Polish: Oświęcim before its separation from the Duchy of Cieszyn (yellow) |
| Capital: | Oświęcim |
| Today: | Poland |
The Duchy of Oświęcim (Polish: Księstwo Oświęcimskie), or the Duchy of Auschwitz (German: Herzogtum Auschwitz), was one of the Duchies of Silesia, formed in the aftermath of the fragmentation of Poland, centered around Oświęcim.
It was established about 1315 on the Lesser Polish lands east of the Biała river held by the Silesian branch of the Polish royal Piast dynasty. Briefly semi-autonomous, with its capital in Oświęcim, it was finally sold to the Kingdom of Poland in 1457. Annexed by the Habsburg Empire in 1772, the remaining ducal title ceased to exist in 1918 with the lands being reincorporated into the Second Polish Republic.
The duchy was created in 1315 in the aftermath of the 12th century fragmentation of Poland on these southeastern estates of the original Duchy of Silesia, which the Polish High Duke Casimir II the Just had split off the Seniorate Province and granted to the Silesian duke Mieszko IV Tanglefoot in 1177. From 1281 onwards, the area had been part of the Silesian Duchy of Cieszyn until after the death of Duke Miezsko I in 1315, the lands of Oświęcim east of the Biała were split off from it as a separate duchy for Mieszko's son Władysław. In 1327 his heir Duke Jan I the Scholastic paid homage to King John of Bohemia and likewise many other Silesian duchies, Oświęcim became a vassal of the Bohemian Crown.
In 1445 the duchies of Zator and Toszek were created from some the lands of the duchy.[1] Though the Duchy of Oświęcim had fallen under the Bohemian vassalage, it was re-united with Poland in 1454, when the last duke, Jan IV, declared himself a vassal of the Polish king Casimir IV Jagiellon. Jan had no male heirs and sold his duchy to King Casimir for the price of 3,000,000 Prague groschen three years later.
At the time the duchy was being sold it consisted of: two towns (Oświęcim and Kęty), two ducal castles (in Oświęcim and Wołek) and 45 villages:[2] Bielany, Łęki, Babice, Lipnik, Osiek, Brzeszcze, Monowice, Dwory, Stara Polanka, Nowa Polanka, Włosienica, Poręba, Grojec, Sparowicze (considered lost), Nidek, Witkowice, Głębowice, Bulowice, Czaniec, Malec, Kańczuga, Nowa Wieś, Roczyny, Broszkowice, Brzezinka, Rajsko, Franciszowice (Pławy), Przecieszyn, Skidziń, Wilczkowice, Wilamowice, Hecznarowice, Bujaków, Kozy, Mikuszowice, Pisarzowice, Hałcnów, Biertułtowice, Komorowice, Żebracz, Bestwina, Dankowice, Stara Wieś, Jawiszowice, Harmęże.
At the General sejm of 1564, King Sigismund II Augustus issued privileges of incorporation recognizing both Duchies of Oświęcim and Zator as part of the Polish Crown into the Silesian County of the Kraków Voivodeship, although the Polish kings retained both ducal titles.
After the First Partition of Poland in 1772, the lands of the former duchies of Oświęcim and Zator were affiliated to the Habsburg Kingdom of Galicia and Lodomeria, an Austrian crown land from 1804, and joined the German Confederation in 1818 by virtue of its historical affiliation to Bohemian Silesia.[3] By the 1919 Treaty of Saint-Germain-en-Laye they were attached to the Polish Kraków Voivodeship.
The Dukes of Oświęcim belonged to the Silesian branch of the Piast dynasty (see also Dukes of Silesia).
| 1314/5-1321/4 | Władysław I (son of Mieszko I of Cieszyn, from 1290 co-regent, due to division of Oświęcim) | |
| 1321/4-1372 | Jan I the Scholastic (son of Władysław I) | |
| 1321/4-1325 | Euphrosyne of Masovia (wife of Władysław I, mother of Jan I, regent, d. 1329) | |
| 1372-1375/6 | Jan II (son Jan I) | |
| 1375/6-1405 | Jan III (son of Jan II, died childless) | |
| 1405–1406 | Przemysław (also known as Przemysław the Younger (Młodszy), son of Przemysław I Noszak (whose uncle was Mieszko I, Duke of Cieszyn), from 1404 prince of half of Ścinawa and Głogów, from 1405 also in Toszek) | |
| 1410-1433/4 | Casimir I (son of Przemysł Młodszy, due to division in 1414 of Oświęcim, Toszek and Strzelin (in Strzelin until 1427)) | |
| 1433/4-1484 | Przemysław of Toszek (son of Casimir I, also prince of Toszek due to its division in 1445) | |
| 1433/4-1456 | Jan IV (Janusz) (brother of Przemysław Toszecki and son of Kazimierz I, also prince of Toszek, from 1445 due to a division of Oświęcim, 1465-1482 Gliwice, abdicated (Oświęcim transferred to Crown of Poland), d. 1496) |
In the aftermath of the First Partition of Poland until 1918, the Habsburg Holy Roman Emperors, from 1804 Emperors of Austria held the title of a Duke of Auschwitz (German: Herzog zu Auschwitz) which constituted part of their official grand title.
| Emperor | Acceded | Deceded | |
| Joseph II | 1772 | 20 February 1790 | |
| Leopold II | 20 February 1790 | 1 March 1792 | |
| Francis I | 1 March 1792 | 2 March 1835 | |
| Ferdinand I | 2 March 1835 | 2 December 1848 | |
| Francis Joseph I | 2 December 1848 | 21 November 1916 | |
| Charles I | 21 November 1916 | 11 November 1918 |