Title: Nicholas I, Duke of Troppau
Content: Nicholas II, Duke of Troppau ; Wenceslaus of Opava ; Johann (died 1325). Nicholas I (Mikuláš I. Opavský) (c. 1255 – 25 July 1318) was the natural son of Bohemian king Ottokar II Přemysl and his mistress Agnes of Kuenring. In 1269 he became Duke of Opava (at modern day Opava, Czech Republic) and thereby the progenitor of the Silesian cadet branch of the Přemyslid dynasty that lasted until 1521. He was legitimated by his father with the consent of Pope Alexander IV and raised at the Prague court. As his half-brother Wenceslaus II was designated to succeed his father on the Bohemian throne, Nicholas in compensation received Troppau, then a part of the Moravian march. He supported his father in the 1278 Battle on the Marchfeld, 
Title: Nicholas the Small
Content:  Nicholas received a good education in the (Henryków). After his father's death on 11 June 1341, he took control of the government of his domains. He almost immediately went to Prague, where on 24 August he paid homage to King John of Bohemia. The huge debts left by his father forced Nicholas on 14 October 1343 to promise not to sell any of his lands without John's consent. In addition, if he did sell, the King had the first option to buy. He also agreed that, if the male line of the Dukes of Ziębice became extinct, the duchy would be annexed 
Title: Nicholas I of Opole
Content:  At the time of his father's death in 1437 Nicholas I was still a minor, and therefore was placed under the care of his older brothers Bolko V and Jan I. On 6 October 1438 Nicholas I and his brothers paid homage to Casimir Jagiełło as King-elect of Bohemia, but after his resignation and the coronation of Albert of Habsburg as King, he paid homage again, this time to the Austrian ruler, during the Congress of Wrocław on 3 December 1438. In 1439 Jan I died unexpectedly without issue, and Nicholas I inherited the whole Duchy of Opole. In 1443 Nicholas received 
Title: Nicholas II, Duke of Opava
Content:  Nicholas II of Opava was a member of the Opava branch of the Bohemian noble Přemyslovci family. His parents were Duke Nicholas I of Opava, who had held Opava since 1269, and Adelheid of Habsburg, a niece of King Rudolf I. He was a supporter of King John of Luxembourg of Bohemia, who gave him Opava as a fief in 1318 and at the same time raised it to an independent duchy. He moved the ducal residence from Hradec nad Moravicí (Grätz) to Opava (Troppau). Also in 1318, he married with Anna, the only sister of Duke Leszek of Ratibór. Since Leszek left no offspring, the Duchy of Ratibór reverted to the Bohemian 
Title: Nicholas III Kőszegi
Content:  Nicholas was born around 1285 into the powerful and wealthy Kőszegi family, as one of the two sons of Gregory. His younger brother was Andrew. His father was killed by a lightning strike in 1297, leaving the child Nicholas as the heir of his grandfather Ivan, who had established a province in Western Transdanubia independently of the royal power. Nicholas had no descendants.
Title: Nicholas I, Duke of Troppau
Content:  captured by Hungarian forces, but regained his duchy from the victorious German king Rudolph of Habsburg. His rule was however challenged by Ottokar's widow Kunigunda Rostislavna, who had retired to Hradec nad Moravicí. In 1283 Nicholas married King Rudolph's niece Adelheid. They had three sons: Nicholas retained the Duchy of Opava after the last Přemyslid ruler of Bohemia, King Wenceslaus III was killed in 1306. The Bohemian Crown however passed to Duke Henry of Carinthia and Nicholas had to accept the pledge of his duchy in favour of the Silesian Piast duke Bolesław III the Generous of Legnica, the husband of King Wenceslaus' III sister Margaret. King Henry's successor John of Luxembourg however redeemed the pawn and in 1318 re-installed Nicholas's son Nicholas II as duke.
Title: Nicholas I of Russia
Content:  Nicholas I (6 July 1796 – 2 March 1855) reigned as Emperor of Russia, King of Poland and Grand Duke of Finland from 1825 until 1855. He was the third son of Paul I and younger brother of his predecessor, Alexander I. Nicholas inherited his brother's throne despite the failed Decembrist revolt against him. He is mainly remembered in history as a reactionary whose controversial reign was marked by geographical expansion, economic growth, and massive industrialisation on the one hand, and centralisation of administrative policies and repression of dissent on the other. Nicholas had a happy marriage that produced a large family; all of their seven children survived childhood. Nicholas's biographer 
Title: Nicholas II Kőszegi
Content:  Nicholas II was born into the senior branch of the powerful and influential Kőszegi family, as the son of Nicholas I. According to genealogist Pál Engel, he had a younger brother John. The exact date of Nicholas' birth is unknown. He was born definitely before 1299, as his father died in that year. Nicholas II frequently appeared in contemporary documents with the nickname "the Rooster". After the death of his father, Nicholas inherited several domains and villages in Western Transdaubia, especially in Vas and Zala counties. After 1299, he owned the castles of Kanizsa, Szentvid, Léka (present-day Lockenhaus, Austria), Rohonc 
Title: Nicholas of Ilok
Content:  His parents were Ladislaus of Ilok, Ban of Macsó, and Anna Stiboriczi, daughter of Stibor of Stiboricz, Voivode of Transylvania. His father died shortly after his birth. He had four brothers: John, Stephen, Peter and Paul. His great-grandfather, Nicholas Kont, served as palatine to King Louis I of Hungary. Nicholas was the best known lord of the city of Ilok. While he was in power, the city experienced its golden age. In 1430, Nicholas' brother Stephen died and Nicholas succeeded him as Ban of Macsó. When King Albert died in 1439, Nicholas supported his widow, Elizabeth of Luxembourg, in her struggle to secure the Holy Crown of Hungary for her son, Ladislaus the Posthumous. As a reward, Queen Elizabeth had him knighted. However, Nicholas soon took the side of Vladislaus III of Poland and allied himself with John Hunyadi. Upon becoming King of Hungary, Vladislaus gave Nicholas and Hunyadi extraordinary powers, appointing them as joint Voivodes of Transylvania.
Title: Nicholas Kőszegi, Bishop of Győr
Content:  Nicholas was an illegitimate descendant of the Kőszegi family, according to a letter of Pope Clement V. His parentage is uncertain; initially, 19th-century historian Antal Pór considered he was the son of Ivan Kőszegi, then modified his standpoint and claimed his father was Gregory, Ivan's son. Genealogist Pál Engel placed his name on the family tree as the son of Ivan's brother, another powerful oligarch Henry Kőszegi, but without explanation and reference. The diocese's almanac claimed Nicholas was the natural son of the eldest brother Nicholas I. Excluding Gregory due to estimate age, Nicholas' biographer Ádám Vajk argued his diocese laid in the territory of Ivan Kőszegi, who ruled Western Transdanubia at the turn of the 13th and 14th centuries. Accordingly, Nicholas was a half-brother of Gregory and 

Question: Who is the father of Nicholas I of Bohemia?
Answer: Ottokar II of Bohemia.
Ottokar II the Great.
Otakar II the Great.