Henry VIII the Sparrow
Henry VIII( VI) the Sparrow( – 14 March 1397) was a Duke of Żagań – Głogów during 1368 – 1378( as a co-ruler with his brothers), from 1378 ruler over Zielona Góra, Szprotawa, Kożuchów, Przemków and Sulechów, and since 1395 ruler over half of Głogów, Ścinawa and Bytom Odrzański.
He was the second son of Henry V of Iron, Duke of Żagań – Głogów, by his wife Anna, daughter of Duke Wenceslaus of Płock.
The origin of his nickname" SparrowWróbel") is unknown.
Balthasar of Żagań
Balthasar, Duke of Żagań( – Przewóz, 15 July 1472), was a Duke of Żagań- Przewóz since 1439( with his brothers as co-rulers until 1449), from 1449 Duke of Żagań.
Deposed during 1461 – 1468, he recovered the Duchy in this year until shortly before his death.
He was the oldest son of Duke Jan I of Żagań by his wife Scholastika, daughter of Rudolf III, Duke of Saxe- Wittemberg and Elector of Saxony.
He was named after his maternal great- grandfather, Balthasar, Landgrave of Thuringia( Scholastika's maternal grandfather).
Henry VI the Older
Henry VI( IV) the Older( bef. 1345 – 5 December 1393) was a Duke of Żagań- Głogów since 1368( with his brothers as co-rulers until 1378).
He was the oldest son of Henry V of Iron, Duke of Żagań- Głogów, by his wife Anna, daughter of Duke Wenceslaus of Płock.
Henry Wenceslaus, Duke of Oels-Bernstadt
Henry Wenceslaus, Duke of Oels- Bernstadt( also known as:" Henry Wenceslaus of Poděbrady Henry Wenceslaus of Bernstadt" or" Henry Wenceslaus of Münsterberg",,, or, or; 7 October 1592, probably in Oleśnica – 21 August 1639, probably in Bernstadt) was Duke of Bernstadt from 1617 until his death.
He also used the titles of Duke of Münsterberg and Count of Glatz, although he never ruled those territories.
From 1629 to 1639 he was Governor of Silesia.
Wenceslaus of Żagań
Wenceslaus of Żagań  (ca. 1434 – 29 April 1488) was a Duke of Żagań-Przewóz since 1439 (with his brothers as co-rulers until 1449), from 1449 Duke of Przewóz (as co-ruler of his younger brother).
He was the third son of Duke Jan I of Żagań by his wife Scholastika, daughter of Rudolf III, Duke of Saxe-Wittemberg and Elector of Saxony.
His uncle, Joe II of Żagań, was his guiding mentor through childhood.
Adam Wenceslaus, Duke of Cieszyn
Adam Wenceslaus of Cieszyn( 12 December 1574 – 13 July 1617), was a Duke of Cieszyn from 1579 until his death.
He was the second but only surviving son of Wenceslaus III Adam, Duke of Cieszyn, by his second wife Sidonia Katharina, daughter of Francis I, Duke of Saxe- Lauenburg.
His older half- brother, Frederick Casimir, only son of Wenceslaus III Adam's first marriage, died a few years before he was born, in 1571.
Rudolf of Żagań
Rudolf of Żagań( ca. 1418 – 18 September 1454) was a Duke of Żagań- Przewóz since 1439( with his brothers as co-rulers until 1449), from 1449 Duke of Żagań( as co-ruler of his older brother).
He was the second son of Duke Jan I of Żagań by his wife Scholastika, daughter of Rudolf III, Duke of Saxe- Wittemberg and Elector of Saxony.
He was named after his maternal grandfather.
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.
Jan I of Żagań
Jan I of Żagań  (– 12 April 1439) was a Duke of Żagań-Głogów, since 1397 (until 1412 with his brothers as co-rulers), since 1403 Duke of Żagań, Krosno Odrzańskie and Świebodzin (again, until 1412 with his brothers as co-rulers) and since 1412 sole ruler of Żagań and Przewóz.
He was the eldest son of Henry VIII the Sparrow, Duke of Głogów by his wife Katharina, daughter of Duke Władysław of Opole.
Sophia of Bavaria
Sophia of Bavaria (1376 – 4 November 1428) was a Queen of Bohemia and the spouse of Wenceslaus, King of Bohemia and King of the Romans.
She was briefly interim regent of Bohemia after the death of Wenceslaus in 1419.

Question: Who is Wenceslaus Of Żagań's paternal grandfather?
Answer: Henry VIII the Sparrow