Wenceslaus II, Duke of Cieszyn
Wenceslaus II of Cieszyn( b. 1488/96- d. 17 November 1524), was a Duke of Cieszyn since 1518 until his death( as co-ruler of his father).
He was the second son of Casimir II, Duke of Cieszyn, by his wife Johanna, daughter of Wiktoryn of Poděbrady, Duke of Opawa.
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.
Elizabeth Lucretia, Duchess of Cieszyn
Elizabeth Lucretia of Cieszyn ; 1 June 1599 – 19 May 1653), was a reigning Duchess of Cieszyn (Teschen, Těšín) from 1625 until her death.
Born as the third child and second daughter of Adam Wenceslaus, Duke of Cieszyn (by his wife Elisabeth, daughter of Gotthard Kettler, Duke of Courland), she was the last ruler of Cieszyn from the Polish Piast dynasty.
Hedwig of Cieszyn
Hedwig of Cieszyn( 1469 – 6 April 1521) was a Polish princess.
She was the only child of Przemysław II, Duke of Cieszyn by his wife Anna, daughter of Duke Bolesław IV of Warsaw.
Frederick William, Duke of Cieszyn
Frederick William of Cieszyn (9 November 1601 – 19 August 1625) was a Duke of Cieszyn since 1617 until his death.
He was the third but only surviving son of Adam Wenceslaus, Duke of Cieszyn, by his wife Elisabeth, daughter of Gotthard Kettler, Duke of Courland.
His mother died from childbirth complications ten days after his birth, on 19 November 1602.
Casimir I, Duke of Cieszyn
Casimir I of Cieszyn( 1280/90 –), was Duke of Cieszyn from 1315, Duke of Siewierz from 1337 and Duke of Bytom from 1357.
He was the second son of Mieszko I, Duke of Cieszyn by his wife, probably called Grzymisława.
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.
Wenceslaus III Adam, Duke of Cieszyn
Wenceslaus III Adam of Cieszyn (December 1524 – 4 November 1579) was a Duke of Cieszyn from 1528 until his death.
He was the second but only surviving son of Wenceslaus II, co-Duke of Cieszyn, by his wife Anna, daughter of Frederick I, Margrave of Brandenburg-Ansbach.
He was born one month after his father's death, on 17 November 1524.
Euphemia of Masovia
Euphemia of Masovia( 1395/97 – before 17 September 1447), was Duchess of Cieszyn by marriage to Bolesław I, Duke of Cieszyn, and regent of the Duchy of Cieszyn during the minority of her sons from 1431.
She was the third daughter of Siemowit IV, Duke of Masovia and Alexandra, daughter of Algirdas, Grand Duke of Lithuania and sister of King Władysław II Jagiełło of Poland, and thus a Polish princess member of the House of Piast in the Masovian branch.
Jakub Skrobanek
Jakub Skrobanek( born c. 1835- died 1910) was a merchant, banker and mayor of Cieszyn.
He was owner of tenement on marketplace in Cieszyn.
From 1873 until 1894 he was councillor of Cieszyn.
From 1875, after resignation of Johann Demel von Elswehr, until 1876 he served as mayor of the city.
On 16 February 1898 he became Honorary Citizen of Cieszyn.

Question: Who is Elizabeth Lucretia, Duchess Of Cieszyn's paternal grandfather?
Answer: Wenceslaus III Adam, Duke of Cieszyn