Title: Alexander, Crown Prince of Yugoslavia
Content:  Alexander, Crown Prince of Yugoslavia, also claiming the crowned royal title of Alexander II Karađorđević ( / Aleksandar II Karađorđević; born 17 July 1945), is the head of the House of Karađorđević, the former royal house of the defunct Kingdom of Yugoslavia and its predecessor the Kingdom of Serbia. Alexander is the only child of King Peter II and his wife, Princess Alexandra of Greece and Denmark. He held the position of crown prince in the Democratic Federal Yugoslavia for the first four-and-a-half months of his life, from his birth until the declaration of the Federal People's Republic of Yugoslavia later in 1945. Born and raised in the United Kingdom, he enjoys close relationships with his relatives in the British royal family. His godparents were King George VI of the United Kingdom and his daughter, the then-Princess Elizabeth (now Queen Elizabeth II). Through his father Alexander is a direct descendant of Queen Victoria, through his great-great-grandfather Prince Alfred, Duke of Saxe-Coburg and Gotha, Victoria's second eldest son. Maternally he is also a direct descendant of Queen Victoria, through his great-great-grandmother Victoria, Empress of Germany, Victoria's eldest daughter. Alexander is known for his support of monarchism and his humanitarian work.
Title: Catherine the Great
Content:  Alexander, Crown Prince of Yugoslavia, is descended from Catherine in three ways: Grand Duchess Maria Alexandrovna of Russia, great-great-granddaughter of Catherine, was a maternal great-grandmother of King Peter II of Yugoslavia, who was the father of Alexander, Crown Prince of Yugoslavia. Olga Constantinovna of Russia, great-great-granddaughter of Catherine, was the maternal great-grandmother of Queen Alexandra of Yugoslavia, who was the mother of Alexander, Crown Prince of Yugoslavia. Sophia of Prussia, great-great-great-granddaughter of Catherine, was the maternal grandmother of Queen Alexandra of Yugoslavia, who was the mother of Alexander, Crown Prince of Yugoslavia.
Title: Maria of Yugoslavia
Content:  Maria of Yugoslavia (born Princess Maria of Romania; 6 January 1900 – 22 June 1961), known in Serbo-Croatian as Marija Karađorđević, was Queen of the Serbs, Croats and Slovenes, later Queen of Yugoslavia, as the wife of King Alexander from 1922 until his assassination in 1934. She was the mother of Peter II, the last Yugoslav monarch. Her citizenship was revoked and her property confiscated by the Yugoslav Communist regime in 1947, but she was "rehabilitated" in 2014.
Title: Maria of Yugoslavia
Content:  Alexander, when she and sometimes the children accompanied him on his trips around Yugoslavia. Maria was well educated. She spoke several languages fluently and enjoyed painting and sculpting under the guidance of artist Iva Despić-Simonović. She also drove a car by herself, which was very unusual for royalty at the time. Following the assassination of her husband, King Alexander I, in Marseille in 1934, her oldest son, then only 11 became Peter II of Yugoslavia, the last reigning Yugoslav king. Her son, being a minor, was placed under the regency of his uncle Prince Paul. The regent gave Maria an allowance of six million dinars for herself and her children: she kept a quarter of the amount, and spend the rest on charity. 
Title: Prince Alexander of Yugoslavia (1924–2016)
Content:  Prince Alexander of Yugoslavia (Александар П. Карађорђевић / Aleksandar P. Karađorđević; 13 August 1924 – 12 May 2016) was the elder son of Prince Paul, who served as Regent of Yugoslavia in the 1930s, and his wife, Princess Olga of Greece and Denmark.
Title: Alexander I of Yugoslavia
Content:  with strong support from Austria-Hungary. The antagonism between the two rival royal houses was such that after the assassination of Prince Mihailo Obrenović in 1868 (an event Karađorđevićs were suspected of taking part in), the Obrenovićs resorted to making constitutional changes, specifically proclaiming the Karađorđevićs banned from entering Serbia and stripping them of their civic rights. Alexander was two when his mother Princess Zorka died in 1890 from complications while giving birth to his younger brother Andrija, who died 23 days later. Alexander spent his childhood in Montenegro. In 1894 his widower father took the four children, including Alexander, to Geneva where the young man completed his elementary education. Alongside his 
Title: Šandor Alexander
Content:  Alexander, known as Der Berühmte (The Notable One), was born in Zagreb to a Croatian Jewish family. His father, Jonas Alexander, was a merchant who came to Zagreb from Güssing, Austria and his mother Roza (née Stern) was from Zagreb old influential Jewish family. Alexander had an older brother, Samuel David, and two sisters, Gizela and Ilka. Alexander attended elementary and high school in Zagreb. He was married to Karolina Dragojla (née Ebenspanger) Alexander, who was from Varaždin. Together they had only child, daughter Zora who was born on September 18, 1895 in Zagreb. Alexander wife died in Zagreb, on September 18, 1925. His daughter was married to Croatian Jewish industrialist and merchant, Artur Marić (born Mayer). In 1944, during World War II, Alexander daughter was killed by Nazis in Auschwitz.
Title: Alexander I of Yugoslavia
Content:  Alexander Karađorđević was born on 16 December 1888 in the Principality of Montenegro as the fourth child (second son) of Peter Karađorđević (son of Prince Alexander of Serbia who thirty years earlier in 1858 was forced to abdicate and surrender power in Serbia to the rival House of Obrenović) and Princess Zorka of Montenegro (eldest daughter of Prince Nicholas of Montenegro). Despite enjoying support from the Russian Empire, at the time of Alexander's birth and early childhood, the House of Karađorđević was in political exile, with family members scattered all over Europe, unable to return to Serbia. Serbia had recently been transformed from a principality into a kingdom under the Obrenovićs, who 
Title: Alexander I of Yugoslavia
Content:  He was said to have wished to marry Grand Duchess Tatiana Nikolaevna of Russia, a cousin of his wife and the second daughter of Tsar Nicholas II, and was distraught by her untimely death in the Russian Civil War. The Russophile Alexander was horrified by the murders of the House of Romanov-including the Grand Duchess Tatiana-and during his reign was very hostile towards the Soviet Union, welcoming Russian emigres to Belgrade. The lavish royal wedding to Princess Maria of Romania was intended to cement the alliance with Romania, a fellow "victor nation" in World War I which like Yugoslavia had territorial 
Title: Alexander I of Yugoslavia
Content:  Alexander I ( – 9 October 1934), also known as Alexander the Unifier,  was a prince regent of the Kingdom of Serbia from 1914 and later a king of Yugoslavia from 1921 to 1934 (prior to 1929 the state was known as the Kingdom of Serbs, Croats and Slovenes). He was assassinated by the Bulgarian Vlado Chernozemski, during a 1934 state visit to France.

Question: Who is the mother of Alexander I of Yugoslavia?
Answer: Princess Zorka of Montenegro.
Zorka Petrović-Njegoš.
Zorka of Montenegro.
Ljubica Petrović-Njegoš, Princess of Montenegro.
Princess Ljubica Petrović-Njegoš, Princess of Montenegro.
Princess Ljubica of Montenegro.
Zorka Karađorđević.
Princess Peter Karađorđević.
Zorka, Princess Peter Karađorđević.
Zorka Ljubica Petrovic-Njegoš, Princess of Montenegro.
Ljubica Petrovic-Njegoš.
Ljubica of Montenegro.