Louis of Opole
Louis of Opole( b. 1450 – d. by 4 September 1476), was a Duke of Opole- Brzeg- Strzelce- Niemodlin during 1466 – 1476( as co-ruler of his father) and briefly in 1476( with his brothers as co-rulers).
He was the eldest son of Duke Nicholas I of Opole by his wife Agnes, daughter of Duke Louis II of Brzeg.
He was named after his maternal grandfather.
William Curti
Cardinal William Curti was an official of the Catholic Church who was involved in religious and academic censure at the University of Paris, in the late 14th century.
He is best remembered as the cardinal who presided at the trial of Nicholas of Autrecourt.
The trial concerned the suspect views of Nicholas of Autrecourt pertaining to the immortality of the soul.
The positive philosophy of Nicholas of Autrecourt conflicted with some points of Catholic theology.
The report of the inquiry is most often referred to as" The Articles of Cardinal Curti".
On May 19, 1346 Nicholas of Autrecourt was sentenced to burn his writings in Paris, France.
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.
Casimir I of Opole
Casimir I of Opole( – 13 May 1230), a member of the Piast dynasty, was a Silesian duke of Opole and Racibórz from 1211 until his death.
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.
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 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.
Nicholas II of Niemodlin
Nicholas II of Niemodlin( – 27 June 1497), was a Duke of Opole- Brzeg- Strzelce- Niemodlin in 1476( as co-ruler of his father) and sole Duke of Niemodlin from 1476 until his death.
He was the third son of Duke Nicholas I of Opole by his wife Agnes, daughter of Duke Louis II of Brzeg.
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.
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.

Question: Who is Nicholas I Of Opole's paternal grandfather?
Answer: Bolko III of Strzelce