Maria Anna of Savoy
Maria Anna of Savoy( 19 September 1803 – 4 May 1884) was Empress of Austria and Queen of Hungary( see Grand title of the Empress of Austria) by marriage to Emperor Ferdinand I of Austria.
Infanta María Teresa of Spain
Infanta Maria Teresa of Spain( 12 November 1882 in Madrid, Kingdom of Spain – 23 September 1912 in Madrid, Kingdom of Spain) was the second eldest child and daughter of Alfonso XII of Spain and his second wife Maria Christina of Austria.
Maria Teresa was an Infanta of Spain and a member of the House of Bourbon by birth.
Margaret of Austria, Queen of Spain
Margaret of Austria (25 December 1584 – 3 October 1611) was Queen consort of Spain and Portugal by her marriage to King Philip III and II.
Anna Radziwiłłowa
Anna Radziwiłłowa( 1567- 1617), was a Polish magnate and court official.
She was the daughter of duke Gotthard Kettler of Courland, and married Albrecht Radziwiłł in 1586.
She regularly attended court and served as a lady- in- waiting to Anne of Austria, Queen of Poland, in 1593- 1598.
Anna of Austria, Queen of Spain
Anna of Austria (2 November 1549 – 26 October 1580) was Queen of Spain by marriage to her uncle, King Philip II of Spain.
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.
Infante Carlos of Spain (1607–1632)
The Infante Carlos of Spain, also known as The Infante Charles of Spain( 15 September 1607 – 30 July 1632), was an" infante" of Spain, the second son of King Felipe III of Spain and Margaret of Austria.
Juan Everardo Nithard
Juan Everardo Nithard(" Johann Eberhard Nithard", in German)( Falkenstein( Upper Austria), 8 December 1607 – Rome, 1 February 1681) was an Austrian priest of the Society of Jesus, confessor of Mariana of Austria( Queen and Regent of Spain), cardinal, and" valido"( royal favorite) of Spain.
Archduchess Margaret of Austria (nun)
Margaret of Austria( 1536 – 1567) was an Archduchess of Austria.
Philip III of Spain
Philip III (14 April 1578 – 31 March 1621) was King of Spain.
He was also, as Philip II, King of Portugal, Naples, Sicily and Sardinia and Duke of Milan from 1598 until his death in 1621.
A member of the House of Habsburg, Philip III was born in Madrid to King Philip II of Spain and his fourth wife and niece Anna, the daughter of Holy Roman Emperor Maximilian II and Maria of Spain.
Philip III later married his cousin Margaret of Austria, sister of Ferdinand II, Holy Roman Emperor.
Although also known in Spain as Philip the Pious, Philip's political reputation abroad has been largely negative – an 'undistinguished and insignificant man,' a 'miserable monarch,' whose 'only virtue appeared to reside in a total absence of vice,' to quote historians C. V. Wedgwood, R. Stradling and J. H. Elliott.
In particular, Philip's reliance on his corrupt chief minister, the Duke of Lerma, drew much criticism at the time and afterwards.
For many, the decline of Spain can be dated to the economic difficulties that set in during the early years of his reign.
Nonetheless, as the ruler of the Spanish Empire at its height and as the king who achieved a temporary peace with the Dutch (1609–1621) and brought Spain into the Thirty Years' War (1618–1648) through an (initially) extremely successful campaign, Philip's reign remains a critical period in Spanish history.

Question: Where did Margaret Of Austria, Queen Of Spain's husband die?
Answer: Madrid