Jan I the Scholastic
Jan I the Scholastic( 1308 /10 – 1372 before 29 September), was a Duke of Oświęcim from 1324 until his death.
He was the eldest child and only son of Duke Władysław of Oświęcim by his wife Euphrosyne, daughter of Duke Boleslaus II of Masovia.
Mieszko I, Duke of Cieszyn
Mieszko I of Cieszyn (also known as Mieszko I of Opole; 1252/56 – by 27 June 1315), was a Duke of Racibórz during 1282–1290 (with his brother as co-ruler) and the first Duke of Cieszyn since 1290 until his death.
He was the oldest son of Władysław, Duke of Opole-Racibórz, by his wife Euphemia, daughter of Władysław Odonic, Duke of Greater Poland.
Wenceslaus I of Zator
Wenceslaus I of Zator( – before 29 July 1468), was a Duke of Oświęcim during 1434 – 1445( with his brothers as co-rulers) and Duke of Zator from 1445 until his death.
He was the eldest son of Duke Casimir I of Oświęcim by his first wife Anna, daughter of Duke Henry VIII of Żagań.
Casimir I of Oświęcim
Casimir I of Oświęcim( 1396 – 7 April 1434) was a Duke of Oświęcim since 1406( under regency until 1414), ruler over Toszek( from 1414) and Strzelin( during 1416 – 1427).
He was the only child of Duke Przemysław of Oświęcim by his unknown wife.
Jan II of Oświęcim
Jan II of Oświęcim( – 19 February 1376) was a Duke of Oświęcim since 1372 until his death.
He was the only son of Jan I the Scholastic, Duke of Oświęcim, by his unknown first wife.
Ladislaus of Salzburg
Władysław of Salzburg, also known as Władysław of Wrocław or Władysław of Silesia( – 27 April 1270), a member of the Silesian Piasts, was co-ruler in the Duchy of Wroclaw since 1248.
He served as chancellor of King Ottokar II of Bohemia from 1255 and was elected Bishop of Bamberg in 1257 and Bishop of Passau in 1265.
Władysław became Prince- Archbishop of Salzburg in the same year, and from 1268 also served as administrator of the Wrocław diocese.
Przemysław of Toszek
Przemysław of Toszek( 1425 – December 1484) was a Duke of Oświęcim during 1434 – 1445( with his brothers as co-rulers) and Duke of Toszek since 1445 until his death.
He was the second son of Duke Casimir I of Oświęcim by his first wife Anna, daughter of Duke Henry VIII of Żagań.
Władysław of Oświęcim
Władysław of Oświęcim (1275/80 – by 15 May 1324), was a Duke of Oświęcim from 1315 until his death.
He was the eldest son of Mieszko I, Duke of Cieszyn by his wife, probably called Grzymisława.
Jan IV of Oświęcim
Jan IV of Oświęcim( 1426/1430 – by 21 February 1497), was a Duke of Oświęcim during 1434 – 1456( until 1445 with his brothers as co-rulers) and Duke of Gliwice from 1465 to 1482.
He was the third son of Duke Casimir I of Oświęcim by his first wife Anna, daughter of Duke Henry VIII of Żagań.
Jan III of Oświęcim
Jan III of Oświęcim( 1366 – by 19 August 1405) was a Duke of Oświęcim since 1376 until his death.
He was the eldest child and only son of Duke Jan II of Oświęcim by his wife Hedwig, daughter of Ludwik I the Fair, Duke of Brzeg.
Initially, historians thought that Dukes Jan II and Jan III are the same person, until the discovery of further sources who confirmed Jan III's existence.

Question: What nationality is Władysław Of Oświęcim's father?