Władysław Opolski
Władysław of Opole( – 27 August/ 13 September 1281/ 2) was a Duke of Kalisz during 1234 – 1244, Duke of Wieluń from 1234 to 1249 and Duke of Opole – Racibórz from 1246 until his death.
He was the second son of Casimir I of Opole by his wife, Viola, probably a Bulgarian lady.
Henry of Opole
Henry of Opole( b. – d.), was a Duke of Opole from 1356 until his death.
He was the third and youngest son of Duke Bolko II of Opole and his wife Elisabeth, daughter of Duke Bernard of Świdnica.
Bolko V the Hussite
Bolko V the Hussite( ca. 1400 – 29 May 1460) was a Duke of Opole between 1422 – 1424( as a co-ruler with his father), ruler over Głogówek and Prudnik since 1424, Duke of Strzelce and Niemodlin from 1450 and ruler over Olesno since 1455.
He was the eldest son of Duke Bolko IV of Opole by his wife Margareta, possibly member of the House of Görz.
Nicholas I of Opole
Nicholas I of Opole( – 3 July 1476) was a duke of Opole since 1437( until 1439 with his brother as co-ruler), Duke of Brzeg from 1450, ruler over Kluczbork from 1451 and Duke of Strzelce, Niemodlin and Olesno from 1460.
He was the fourth son of Duke Bolko IV of Opole by his wife Margareta, possibly member of the House of Gorizia.
Bolko III of Strzelce
Bolko III of Strzelce (also known as of Opole; ; – 21 October 1382) was a Duke of Opole during 1356–1370 (with his brothers as co-rulers) and Duke of Strzelce from 1375 until his death.
He was the second son of Duke Bolko II of Opole by his wife Elisabeth, daughter of Duke Bernard of Świdnica.
Euphrosyne of Opole
Euphrosyne of Opole( and," YefrosiniyaFrosya")( 1228/30 – 4 November 1292) was a daughter of Casimir I of Opole and his wife Viola, Duchess of Opole.
She was a member of the House of Piast and became Duchess of Kujavia from her first marriage and Duchess of Pomerania from her second marriage.
Bolko IV of Opole
Bolko IV of Opole (1363/67 – 6 May 1437), was a Duke of Strzelce and Niemodlin during 1382–1400 (with his brothers as co-rulers), Duke of Opole from 1396 (until 1400 with his brother as co-ruler, except Olesno).
He was the second son of Duke Bolko III of Strzelce by his wife Anna, probably daughter of Duke Jan I of Oświęcim.
Margareta of Opole
Margareta of Opole( – 15 January 1454), was a Polish princess.
She was a member of the Opole branch of House of Piast and by marriage a Duchess of Oława- Lubin- Chojnów.
She was the daughter of Duke Bolko IV of Opole, by his wife Margareta, possibly a member of the House of Görz.
Jan I of Opole
Jan I of Opole( 1410/1413 – 5 September 1439) was a Duke of Opole since 1437( with his brother as co-ruler).
He was the second son of Duke Bolko IV of Opole by his wife Margareta, possibly member of the House of Görz.
Bolko II of Opole
Bolko II of Opole( before 1300 – 21 June 1356), was a Duke of Opole from 1313( with his brother as co-ruler until 1323).
He was the second son of Duke Bolko I of Opole by his wife Agnes, probably a daughter of Margrave Otto III of Brandenburg.

Question: Who is Bolko Iv Of Opole's paternal grandfather?