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.
Kaya Alp
Kaya Alp was, according to Ottoman tradition, the son of Kızıl Buğa and the father of Suleyman Shah, who was, in turn, the grandfather of Ertuğrul, and the great grandfather of the Ottoman Empire founder, Osman I.
Henry Krause
Henry J." Red" Krause, Jr.( August 28, 1913 – February 20, 1987) was an American football offensive lineman in the National Football League for the Brooklyn Dodgers and the Washington Redskins.
He played college football at St. Louis University.
He is the grandfather of Jennifer Krause
He is the great grandfather of Payton Hoeing
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.
Fred Le Deux
Frederick" Fred" Le Deux( born 4 December 1934) was an Australian rules footballer who played with Geelong in the Victorian Football League( VFL).
He is the grandfather of Tom Hawkins.
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 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.
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.
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.
Helena of Oświęcim
Helena of Oświęcim (1478/80 – after 1524), was a Polish princess member of the House of Piast from the Oświęcim branch and ruling Duchess of Karniów since 1506 until 1523.
She was the only child of Duke Jan IV of Oświęcim by his second wife Barbara, daughter of Duke Nicholas V of Karniów.

Question: Who is Helena Of Oświęcim's paternal grandfather?
Answer: Casimir I of Oświęcim