Maria of Austria, Duchess of Jülich-Cleves-Berg
Archduchess Maria of Austria (15 May 1531 – 11 December 1581) was the daughter of Emperor Ferdinand I from the House of Habsburg and Anna Jagiello.
She married William, Duke of Jülich-Cleves-Berg on 18 July 1546 as his second wife.
Their children were:
Archduke Otto of Austria (1865–1906)
Archduke Otto Franz Joseph Karl Ludwig Maria of Austria (21 April 1865 – 1 November 1906) was the second son of Archduke Karl Ludwig of Austria (younger brother of Emperor Franz Joseph I of Austria) and his second wife, Princess Maria Annunciata of Bourbon-Two Sicilies.
He was the father of Charles I of Austria, the last Emperor of Austria.
Archduchess Maria of Austria (1584–1649)
Archduchess Maria of Austria( German:" Erzherzogin Maria von Österreich")
( Innsbruck, 16 June
1584 – Innsbruck, 2 March 1649) was the daughter of Ferdinand II, Archduke of Austria and his second wife Anne Juliana Gonzaga.
She became a nun.
William, Duke of Jülich-Cleves-Berg
William of Jülich-Cleves-Berge
(William I of Cleves, William V of Jülich-Berg) (28 July 1516 – 5 January 1592) was a Duke of Jülich-Cleves-Berg (1539–1592).
William was born in and died in Düsseldorf.
He was the only son of John III, Duke of Jülich-Cleves-Berg, and Maria, Duchess of Jülich-Berg.
William took over rule of his father's estates (the Duchy of Cleves and the County of Mark) upon his death in 1539.
Despite his mother having lived until 1543, William also became the Duke of Berg and Jülich and the Count of Ravensberg.
From 1538 to 1543, William held the neighbouring Duchy of Guelders, as successor of his distant relatives, the Egmond dukes.
Emperor Charles V claimed this duchy for himself as the dukes had sold their right of heritage, and William tried to hold on to it.
He made a treaty with the King of France and married Jeanne d'Albret, and with this backup dared to challenge the Emperor.
All too soon he learned that the French did not lift a finger to help him, and he was overwhelmed and had to surrender.
In accordance with the Treaty of Venlo (1543)
that was the result of this war,
Guelders and the County of Zutphen were transferred to Charles V, Holy Roman Emperor, combining them with the Habsburg Netherlands.
William then tried to strengthen his inherited territories and launched an impressive development project for the most important cities.
The three duchies all got new main fortresses as major strongpoints, for the older medieval fortifications had proved to be no match against the Imperial artillery.
The cities of Jülich, Düsseldorf and Orsoy became fortresses for the duchies of Jülich, Berg and Cleves respectively, and Jülich and Düsseldorf were turned into impressive residences.
For this task, the renowned Italian architect Alessandro Pasqualini from Bologna was hired, who had already made some impressive display of his craft in the Netherlands.
He made the plans for the fortifications and palaces, of which some traces still remain, especially at Jülich where the citadel (built 1548-1580) is a major landmark, with parts of the Renaissance palace still standing.
William's sister Anne of Cleves was, for six months, the fourth wife of King Henry VIII of England.
Through his daughter Marie Eleonore, he is ancestor of Marie Louise of Hesse-Kassel, wife of John William Friso, Prince of Orange therefore ancestor of all the current European monarchs.
Archduchess Maria Elisabeth of Austria (1737–1740)
Archduchess Maria Elisabeth of Austria( Full name( German):" Maria Elisabeth Amalia Antonia Josefa Gabriele Johanna Agathe"; 5 February 1737 – 7 June 1740), was the eldest child and daughter of Archduchess Maria Theresa of Austria, later Queen of Hungary and Bohemia, and Duke Francis of Lorraine, later Francis I, Holy Roman Emperor.
Archduchess Maria Luisa of Austria, Princess of Tuscany (1798-1857)
Archduchess Maria Luisa of Austria, Princess of Tuscany( 30 August 1798 – 15 June 1857) was a member of the House of Habsburg- Lorraine.
Archduchess Maria Amalia of Austria (1780–1798)
Archduchess Maria Amalia of Austria ("Maria Amalia Josephe Johanna Katharina Theresia"; 15 October 1780 - 25 December 1798) was an Archduchess of Austria by birth.
Archduchess Maria Theresa of Austria (1845–1927)
Archduchess Maria Theresa of Austria (15 July 1845 – 8 October 1927) was a member of the Austrian house of Habsburg-Lorraine.
Archduchess Maria Carolina of Austria (1740–1741)
Archduchess Maria Carolina of Austria (
Maria Carolina Ernestina Antonia Johanna Josefa; 12 January 1740 – 25 January 1741), was the third child and daughter of Archduchess Maria Theresa of Austria, later Holy Roman Empress and Duke Francis of Lorraine.
Archduchess Maria Antonia of Austria (1899–1977)
Archduchess Maria Antonia of Austria (13 July 1899 – 22 October 1977) was a daughter of Archduke Leopold Salvator of Austria and Infanta Blanca of Spain.
She was member of the Tuscan branch of the Imperial House of Habsburg, an Archduchess of Austria and Princess of Tuscany by birth.
In 1919, after the fall of the Austro Hungary Empire, she moved with her family to Spain.
In 1924 she married Ramón de Orlandis y Villalonga, a Spanish aristocrat.
When she became a widow during the Spanish civil war Archduchess Maria Antonia moved permanently to South America where she remarried.

Question: When is Maria Of Austria, Duchess Of Jülich-Cleves-Berg's husband's birthday?
Answer: 28 July 1516