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.
Hedwig of Brandenburg
Hedwig of Brandenburg, also called Hedwig of Ballenstedt( – end of March 1203), a member of the House of Ascania, was Margravine of Meissen from 1156 until 1190 by her marriage with Margrave Otto II.
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.
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.
Hedwig of Gudensberg
Hedwig of Gudensberg, also known as" Hedwig of Hesse"( 1098 – 1148) was German regent: she served as regent of Thuringia during the minority of her son Louis II from 1140.
Przemysław II, Duke of Cieszyn
Przemyslaus II of Cieszyn, also known as Primislaus II of Teschen or Przemko II (1422/25 – 18 March 1477), was a Duke of Cieszyn (Teschen, Těšín) from 1431, ruler over Bielsko and Skoczów (from 1442), Duke of half of both Duchy of Głogów (Glogau, Hlohov) and Duchy of Ścinawa from 1460 and from 1468 sole ruler over Cieszyn.
He was the third son of Duke Boleslaus I of Cieszyn by his second wife, Euphemia, daughter of Duke Siemowit IV of Masovia.
Theodred II (Bishop of Elmham)
Theodred II was a medieval Bishop of Elmham.
The date of Theodred's consecration unknown, but the date of his death was sometime between 995 and 997.
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.
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.

Question: What is the date of death of Hedwig Of Cieszyn's father?
Answer: 18 March 1477