Question: Which son of Constantine II was crowned Prince AFTER the Greek monarchy was abolished in 1973?

full_context: Document 1: Philippe of Belgium: Philippe (] , French: "Philippe Léopold Louis Marie" , Dutch: "Filip Leopold Lodewijk Maria" , German: "Philipp Leopold Ludwig Maria" ; born 15 April 1960) is the seventh King of the Belgians, having ascended the throne on 21 July 2013, following his father's abdication. He is the eldest child of King Albert II, whom he succeeded upon Albert's abdication for health reasons, and Queen Paola. He married Countess Mathilde d'Udekem d'Acoz (now Queen Mathilde), with whom he has four children. King Philippe's elder daughter, Princess Elisabeth, is first in the line of succession.
Document 2: Constantine II of Greece: Constantine II (Greek: Κωνσταντῖνος Β΄ , "Konstantínos II", ] ; born 2 June 1940) is a former monarch who was the last King of Greece, reigning from 1964 until the abolition of the Greek monarchy in 1973.
Document 3: Greek royal family: The Greek royal family (Greek: Ελληνική Βασιλική Οικογένεια) is a branch of the House of Glücksburg that reigned in Greece from 1863 to 1924 and again from 1935 to 1973. Its first monarch was George I, the second son of King Christian IX of Denmark. He and his successors styled themselves "Kings of the Hellenes". Most members of the dynasty (aside from the last king to reign, Constantine II and his queen consort, Anne-Marie of Denmark) hold the title "Prince or Princess of Greece and Denmark" with the style "Royal Highness", except Marina, Consort of Prince Michael, and their daughters Princess Alexandra and Princess Olga.
Document 4: Line of succession to the former Romanian throne: The succession order to the throne of the Romanian monarchy, abolished since 1947, was regulated by the monarchical constitution of 1923 and the 1884 Law of the Romanian Royal House Rules enacted pursuant to the 1866 Constitution of Romania which had confirmed the enthronement of Prince Karl (Carol) of Hohenzollern-Sigmaringen. The defunct 1923 Constitution stipulated Salic law, according to which the throne was hereditary in King Carol I's legitimate descent and, if his male issue failed, in the descent of his brothers of the Sigmaringen princely branch of the House of Hohenzollern, according to agnatic primogeniture and to the perpetual exclusion of females and their descendants. The last monarch to reign in Romania was King Michael I, who was born in 1921, abdicated his throne on 30 December 1947 under coercion, and went into exile in Switzerland.
Document 5: Prince Constantijn of the Netherlands: Prince Constantijn of the Netherlands ("Constantijn Christof Frederik Aschwin"; born 11 October 1969) is the third and youngest son of the former Dutch queen, Beatrix, and her husband, Claus von Amsberg, and is the younger brother of the reigning Dutch king, Willem-Alexander. He is a member of the Dutch Royal House of Orange-Nassau and currently fourth in the line of succession to the Dutch throne.
Document 6: Princess Tatiana of Greece and Denmark: Princess Tatiana of Greece and Denmark (born Tatiana Ellinka Blatnik, 28 August 1980) is the wife of Prince Nikolaos, son of Constantine II, who reigned as King of Greece until the monarchy was abolished in 1973.
Document 7: Pavlos, Crown Prince of Greece: Pavlos, Crown Prince of Greece, {'1': ", '2': ", '3': 'RE', '4': "} (Greek: Παύλος ; born 20 May 1967) is the eldest son and second child of Constantine II, the last King of Greece from 1964 to 1973 and his wife, Anne-Marie of Denmark. Pavlos was heir apparent to the throne of Greece and was its crown prince from birth, remaining so during his father's reign until the monarchy's abolition.
Document 8: Line of succession to the former Greek throne: The Greek monarchy was abolished by the then-ruling military regime on 1 June 1973, an act that was confirmed by plebiscite on 8 December 1974 after the regime's fall. The title of king is used by the last reigning monarch, Constantine II (r. 1964–1973). His son, the Crown Prince Pavlos, who was born in 1967, is the heir apparent to the pretended title.
Document 9: Prince Nikolaos of Greece and Denmark: Prince Nikolaos of Greece and Denmark (born 1 October 1969) is the third child of Constantine II and Anne-Marie of Denmark, who were the last King and Queen of Greece, reigning from 1964 to 1973.
Document 10: Princess Alexia of Greece and Denmark: Princess Alexia of Greece and Denmark (Greek: Αλεξία ; born 10 July 1965) is the eldest child of Constantine II and Anne-Marie of Denmark, who were the last King and Queen of Greece, reigning from 1964 to 1973.
Document 11: Princess Theodora of Greece and Denmark: Princess Theodora of Greece and Denmark (Greek: Θεοδώρα , born 9 June 1983 in London), also known under her stage name Theodora Greece, is an actress. She is the younger daughter and fourth of the five children of former King Constantine II of Greece and Anne-Marie of Denmark.
Document 12: Frederik, Crown Prince of Denmark: Frederik, Crown Prince of Denmark, Count of Monpezat, {'1': ", '2': ", '3': 'RE, SKmd', '4': "} (Frederik André Henrik Christian; born 26 May 1968) is the heir apparent to the throne of Denmark. Frederik is the elder son of Queen Margrethe II and Henrik, the Prince Consort.
Document 13: Princess Maria-Olympia of Greece and Denmark: Princess Maria-Olympia of Greece and Denmark (born 25 July 1996 in New York City) is the oldest child and only daughter of Pavlos, Crown Prince of Greece and Marie-Chantal, Crown Princess of Greece. Her paternal grandparents are Constantine II and Anne-Marie of Denmark, who were the last King and Queen of the Hellenes.
Document 14: Princess Irene of Greece and Denmark: Princess Irene of Greece and Denmark (Greek: Πριγκίπισσα Ειρήνη της Ελλάδας και Δανίας ; born 11 May 1942) is the youngest child of King Paul of Greece and his wife Frederika of Hanover. She is the younger sister of Queen Sofía of Spain and of the deposed King Constantine II of Greece.
Document 15: Prince Nicholas of Greece and Denmark: Prince Nicholas of Greece and Denmark (, 22 January 1872 – 8 February 1938), of the Glücksburg branch of the House of Oldenburg, was the fourth child and third son of King George I of Greece, and of Queen Olga. He was known as "Greek Nicky" in the family to distinguish him from his paternal first cousin Emperor Nicholas II of Russia. Prince Nicholas was a talented painter, often signing his works as "Nicolas Leprince."
ground_truth: Pavlos, Crown Prince of Greece