Information: - The Przemyslids or Pemyslids were a Bohemian (Czech) royal dynasty which reigned in Bohemia and Moravia (9th century1306), and parts of Hungary, Silesia, Austria and Poland. - Nicholas I ( Czech : Mikulas I. Opavsky ) ( c. 1255 -- 25 July 1318 ) was the natural son of Bohemian king Ottokar II Pemysl 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 Pemyslid dynasty that lasted until 1521 . He was legitimated by his father with the consent of Pope Urban 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 , was 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 Moravici . In 1283 Nicholas married King Rudolph 's niece Adelheid . They had three sons : Nicholas II , Duke of Troppau Wenceslaus of Opava Johann ( died 1325 ) . Nicholas retained the Duchy of Opava after the last Pemyslid 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 Bolesaw 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 . - Hungary is a unitary parliamentary republic in Central Europe. It covers an area of , situated in the Carpathian Basin and bordered by Slovakia to the north, Romania to the east, Serbia to the south, Croatia to the southwest, Slovenia to the west, Austria to the northwest, and Ukraine to the northeast. With about 10 million inhabitants, Hungary is a medium-sized member state of the European Union. The official language is Hungarian, which is the most widely spoken Uralic language in the world. Hungary's capital and largest metropolis is Budapest, a significant economic hub, classified as an Alpha- global city. Major urban areas include Debrecen, Szeged, Miskolc, Pecs and Gyr. - Agnes of Kuenring (ca. 1236 - fl. 1261), was an Austrian noble, courtier of Queen Margaret of Austria and mistress of her spouse, King Ottokar II of Bohemia. She was the first historically documented mistress of a Bohemian sovereign. - Poland, officially the Republic of Poland, is a country in Central Europe, situated between the Baltic Sea in the north and two mountain ranges (the Sudetes and Carpathian Mountains) in the south. Bordered by Germany to the west; the Czech Republic and Slovakia to the south; Ukraine and Belarus to the east; and the Baltic Sea, Kaliningrad Oblast (a Russian exclave) and Lithuania to the north. The total area of Poland is , making it the 69th largest country in the world and the 9th largest in Europe. With a population of over 38.5million people, Poland is the 34th most populous country in the world, the 8th most populous country in Europe and the sixth most populous member of the European Union. Poland is a unitary state divided into 16 administrative subdivisions, and its capital and largest city is Warsaw. Other metropolises include Krakow, Wrocaw, Pozna, Gdask and Szczecin. What is the relationship between 'nicholas i' and 'ottokar ii of bohemia'?
The answer to this question is:
father