Beatrix (Beatrix Wilhelmina Armgard, ˈbeːjaːtrɪks ˌʋɪlɦɛlˈminaː ˈʔɑr(ə)mɡɑrt; born 31 January 1938) is a member of the Dutch royal house who reigned as Queen of the Netherlands from 1980 until her abdication in 2013. Beatrix is the eldest daughter of Queen Juliana and her husband, Prince Bernhard of Lippe-Biesterfeld. Upon her mother's accession in 1948, she became heir presumptive. Beatrix attended a public primary school in Canada during World War II, and then finished her primary and secondary education in the Netherlands in the post-war period. In 1961, she received her law degree from Leiden University. In 1966, Beatrix married Claus von Amsberg, a German diplomat, with whom she had three children. When her mother abdicated on 30 April 1980, Beatrix succeeded her as queen. Beatrix's reign saw the country's Caribbean possessions reshaped with Aruba's secession and becoming its own constituent country within the kingdom in 1986. This was followed by the dissolution of the Netherlands Antilles in 2010, which created the new special municipalities of Bonaire, Sint Eustatius, and Saba, and the two new constituent countries of Curaçao and Sint Maarten. On Koninginnedag (Queen's Day), 30 April 2013, Beatrix abdicated in favour of her eldest son, Willem-Alexander. At the time of her abdication at age 75, Beatrix was the oldest reigning monarch in the country's history. Beatrix Wilhelmina Armgard was born on 31 January 1938 at Soestdijk Palace in Baarn, Netherlands, as the first child of Princess Juliana and Prince Bernhard of Lippe-Biesterfeld. Beatrix was baptised on 12 May 1938 in the Great Church in The Hague. Her five godparents were King Leopold III of Belgium; Princess Alice, Countess of Athlone; Elisabeth, Princess of Erbach-Schönberg; Duke Adolf Friedrich of Mecklenburg; and Countess Allene de Kotzebue. Beatrix's middle names are the first names of her maternal grandmother (the then reigning Queen Wilhelmina) and her paternal grandmother (Princess Armgard of Sierstorpff-Cramm).