János Wass (] ), or "Prince" John, (16th century) was an illegitimate son of King Louis II of Hungary and Bohemia, the ill-fated king, who died young and in mysterious circumstances at the Battle of Mohács by a liaison with his mother, Anne of Foix-Candale's former lady's maid, Angelitha Wass.
Dominic Habsburg-Lothringen, also known as Dominic von Habsburg (born 4 July 1937, Sonnberg, Lower Austria) is a member of the House of Habsburg-Lorraine, also known by his ancestral titles as Archduke Dominic of Austria, Prince of Hungary, Bohemia, and Tuscany.
 All noble, royal, and imperial titles have been abolished and are forbidden in Austria and in Hungary.
Anna of Bohemia and Hungary (Buda, Hungary, 23 July 1503 – Prague, Bohemia, 27 January 1547), sometimes known as Anna Jagellonica, Queen of the Romans (Germany), Bohemia and Hungary as the wife of King Ferdinand I, later Holy Roman Emperor.
Ferdinand I (Spanish: "Fernando I" ) (10 March 1503 – 25 July 1564) was Holy Roman Emperor from 1558, king of Bohemia and Hungary from 1526, and king of Croatia from 1527 until his death.
 Before his accession, he ruled the Austrian hereditary lands of the Habsburgs in the name of his elder brother, Charles V, Holy Roman Emperor.
 Also, he often served as Charles' representative in Germany and developed useful relationships with German princes.
Princess "Anna" Maria Maximiliane Stephania Karoline Johanna Luisa Xaveria Nepomucena Aloysia Benedicta of Saxony, Duchess of Saxony (Full German name: "Prinzessin Anna Maria Maximiliane Stephania Karoline Johanna Luisa Xaveria Nepomucena Aloysia Benedicta von Sachsen, Herzogin zu Sachsen") (born 4 January 1836 in Dresden, Kingdom of Saxony; died 10 February 1859 in Naples, Kingdom of the Two Sicilies) was the seventh child and fourth eldest daughter of John of Saxony and his wife Amalie Auguste of Bavaria and a younger sister of Albert of Saxony and George of Saxony.
 Through her marriage to Archduke Ferdinand, Hereditary Prince of Tuscany, Anna was a member of the House of Habsburg-Lorraine and an Archduchess and Princess of Austria and Princess of Hungary, Croatia, Bohemia, and Tuscany.
 Ann died shortly before her husband succeeded his father as Grand Duke of Tuscany.
Anne of Bohemia (11 May 1366 – 7 June 1394) was Queen of England as the first wife of King Richard II.
 A member of the House of Luxembourg, she was the eldest daughter of Charles IV, Holy Roman Emperor and King of Bohemia, and Elizabeth of Pomerania.
 She died at 28 after 12 years of marriage; she was childless, and greatly mourned by her husband.
Angelitha Wass (] ; 15th century – died after 1521) was a Hungarian lady's maid of Anne of Foix-Candale, Queen consort of Bohemia and Hungary, and later a mistress of Anne's son, Louis II Jagiellon, King of Hungary.
Margaret de la Pole (1426 – after 5 December 1485), Countess of Kendal (Candale).
 Paternal grandmother of Anne of Foix-Candale, queen of Hungary and Bohemia.
Elizabeth of Austria (German: "Elisabeth" , Polish: "Elżbieta Rakuszanka" ; Lithuanian: "Elžbieta Habsburgaitė" ; c. 1436 – 30 August 1505) was the wife of King Casimir IV of Poland and thus Queen of Poland and Grand Duchess of Lithuania.
 Orphaned at an early age, she spent her childhood in the court of Holy Roman Emperor Frederick III.
 As one of the three surviving grandchildren of Emperor Sigismund, she had a strong claim to the kingdoms of Hungary and Bohemia.
 That made her an attractive bride for a Polish prince.
 The Polish nobility, seeking to increase Polish influence in Hungary and Bohemia, pursued marriage with Elizabeth since she was born and finally succeeded in 1454.
 Her marriage to Casimir was one of the most exemplary royal marriages in Poland.
 She gave birth to thirteen children, eleven of whom survived to adulthood.
 Four of her sons were crowned as kings.
Isabella Jagiellon (Hungarian: "Izabella királyné" ; Polish: "Izabela Jagiellonka" ; 18 January 1519 – 15 September 1559) was the oldest child of Polish King Sigismund I the Old and his Italian wife Bona Sforza.
 In 1539, she married John Zápolya, Voivode of Transylvania and King of Hungary, becoming Queen consort of Hungary.
 At the time Hungary was contested between Archduke Ferdinand of Austria who wanted to add it to the Habsburg domains (see Royal Hungary), local nobles who wanted to keep Hungary independent (see Eastern Hungarian Kingdom), and Sultan Suleiman the Magnificent who saw it as a vassal state of the Ottoman Empire (see also Little War in Hungary).
 While Isabella's marriage lasted only a year and a half, it did produce a male heir – John Sigismund Zápolya born just two weeks before his father's death in July 1540.
 She spent the rest of her life embroiled in succession disputes on behalf of her son.
 Her husband's death sparked renewed hostilities but Sultan Suleiman established her as a regent of the eastern regions of the medieval Kingdom of Hungary on behalf of her infant son.
 The region developed as a semi-independent buffer state noted for its freedom of religion.
 Ferdinand, however, never renounced his claims to reunite Hungary and conspired with Bishop George Martinuzzi who forced Isabella to abdicate in 1551.
 She returned to her native Poland to live with her family.
 Sultan Suleiman retaliated and threatened to invade Hungary in 1555–56 forcing nobles to invite Isabella back to Transylvania.
 She returned in October 1556 and ruled as her son's regent until her death in September 1559.

Question: In what year was Anne of Bohemia and Hungary's husband born?
Answer: 1503