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.
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.
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.
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.
Frederick Casimir of Cieszyn
Frederick Casimir of Cieszyn also known as of Fryštát (b. December 1541/January 1542 - d. 4 May 1571), was a Polish prince member of the House of Piast in the Cieszyn branch and ruler over Fryštát, Skoczów (both since 1560), and Bielsko (since 1565).
He was the second child but only son of Wenceslaus III Adam, Duke of Cieszyn, by his first wife Maria, daughter of Jan of Pernštejn.
Jan of Cieszyn
Jan of Cieszyn (1339/40 – after 18 May 1359), was a Polish prince, member of the Piast dynasty in the Cieszyn branch.
He was the fourth son of Casimir I, Duke of Cieszyn, by his wife Euphemia, daughter of Duke Trojden
I of Czersk-Warsaw.
Johan Braakensiek
Johan Coenraad Braakensiek( 24 May 1858, Amsterdam – 27 February 1940, Amsterdam) was a Dutch painter, illustrator and political cartoonist.
He is the grandfather of Jan van Oort.
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.

Question: Who is Jan Of Cieszyn's paternal grandfather?
Answer: Mieszko I, Duke of Cieszyn