Maximilian II, Holy Roman Emperor
Maximilian II (31 July 1527 – 12 October 1576), a member of the Austrian House of Habsburg, was Holy Roman Emperor from 1564 until his death.
He was crowned King of Bohemia in Prague on 14 May 1562 and elected King of Germany (King of the Romans) on 24 November 1562.
On 8 September 1563 he was crowned King of Hungary and Croatia in the Hungarian capital Pressburg
(Pozsony in Hungarian; now Bratislava, Slovakia).
On 25 July 1564 he succeeded his father Ferdinand I as ruler of the Holy Roman Empire.
Maximilian's rule was shaped by the confessionalization process after the 1555 Peace of Augsburg.
Though a Habsburg and a Catholic, he approached the Lutheran Imperial estates with a view to overcome the denominational schism, which ultimately failed.
He also was faced with the ongoing Ottoman–Habsburg wars and rising conflicts with his Habsburg Spain cousins.
According to Fichtner, Maximilian failed to achieve his three major aims: rationalizing the government structure, unifying Christianity, and evicting the Turks from Hungary.
Beatrice of Swabia
Beatrice or Beatrix of Swabia( April/ June 1198 – 11 August 1212), a member of the Hohenstaufen dynasty, was Holy Roman Empress and German Queen in 1212 as the first wife of the Welf emperor Otto IV.
She was also the shortest- serving Holy Roman Empress, dying three weeks into her marriage.
Archduchess Maria Josepha of Austria
Archduchess Maria Josepha of Austria( Maria Josepha Gabriella Johanna Antonia Anna; 19 March 1751, in Vienna – 15 October 1767).
She was the daughter of Francis I, Holy Roman Emperor( 1708 – 1765) and Maria Theresa of Austria, Holy Roman Empress( 1717–1780).
She died of smallpox at the age of 16 and was buried in the Imperial Crypt, Vienna, Austria.
Maria of Austria, Holy Roman Empress
Archduchess Maria of Austria (21 June 1528 – 26 February 1603) was Holy Roman Empress and queen consort of Bohemia and Hungary as the spouse of Maximilian II, Holy Roman Emperor and King of Bohemia and Hungary.
She served as regent of Spain in the absence of her father Emperor Charles V from 1548 until 1551, and in the absence of her brother Philip II, from 1558 to 1561.
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.
Adelaide of Italy
Adelaide of Italy (93116 December 999 AD) , also called Adelaide of Burgundy, was a Holy Roman Empress by marriage to Holy Roman Emperor Otto the Great; she was crowned as the Holy Roman Empress with him by Pope John XII in Rome on 2 February 962.
She was regent of the Holy Roman Empire as the guardian of her grandson in 991-995.
Elisabeth Christine of Brunswick-Wolfenbüttel
Elisabeth Christine of Brunswick- Wolfenbüttel( 28 August 1691 – 21 December 1750) was Princess of Brunswick- Wolfenbüttel, Holy Roman Empress, German Queen, Queen of Bohemia and Hungary; and Archduchess of Austria by her marriage to Emperor Charles VI.
She was renowned for her delicate beauty and also for being the mother of Empress Maria Theresa.
She was the longest serving Holy Roman Empress.
Maria of Brabant, Holy Roman Empress
Maria of Brabant( c. 1190 – May/ June 1260), a member of the House of Reginar, was Holy Roman Empress from 1214 until 1215 as the second and last wife of the Welf emperor Otto IV.
Anna de' Medici, Archduchess of Austria
Anna de' Medici( 21 July 1616 – 11 September 1676) was a daughter of Cosimo II de' Medici, Grand Duke of Tuscany and his wife Maria Maddalena of Austria.
A patron of the arts, she married Ferdinand Charles, Archduke of Further Austria in 1646.
They were the parents of Claudia Felicitas of Austria, Holy Roman Empress.
Helena Antonia
Helena Antonia( 1550 – 1595) was a bearded female court dwarf of Maria of Austria, Holy Roman Empress and was a favorite of Margaret of Austria, Queen of Spain, and also a lady- in- waiting for Constance of Austria.
She was born in Liège.

Question: When did Maria Of Austria, Holy Roman Empress's husband die?
Answer: 12 October 1576