POD: Maria Anna of Neuburg's disease in 1690-91 was in fact the suspected pregnancy people though it was at the time and she gives birth to a girl in 22 August, 1691 (the basis of an TL I really hope to write one day)
The Last Hapsburg of Spain and her descendants, in 1770
Maria Isabella I,
Queen of Spain, etc. (b.1691:d.1756) m. Joseph I,
Elector of Bavaria (b.1692:d.1733)
1) Carlos, Prince of Asturias (b.1708:d.1721)
2) Juan I, King of Spain, etc. (b.1710:d.1768) m. Amelia, Princess of Great Britain (b.1711)
1) Maria Dorothea, Infanta of Spain (b.1729) m. Edward, Duke of York (b.1739:d.1765)
1) Josephine, Princess of York (b.1754)
2) Georgiana, Princess of York (b.1756)
3) Arthur, Duke of York (b.1759)
2) Maria Magdalena, Infanta of Spain (b.1730) m. Honoré III, Prince of Monaco (b.1720)
1) Honoré, Hereditary Prince of Monaco (b.1755)
2) Marie Isabelle, Princess of Monaco (b.1757)
3) Claudine, Princess of Monaco (b.1758)
4) Miscarriage (1761)
5) Louis Ercole, Prince of Monaco (b.1763)
6) Lucien, Prince of Monaco (b.1764)
3) Stillborn son (1732)
4) Maria Isabella, Infanta of Spain (b.1733) m. Joseph, Heir of the Hapsburg Realms (b.1741)
1) Stillborn son (1765)
2/3) Stillborn twins (1766)
4) Miscarried daughter (1767)
5) Rudolph, Archduke of Austria (b.1768)
6) Maria Theresa, Archduchess of Austria (b.1768)
7) Stillborn daughter (1769)
5) Maria Leonor, Infanta of Spain and Abbess of the Convent of Las Descalzas Reales (b.1735)
6) Maria Josefa, Infanta of Spain (b.1737:d.1763) m. Joseph, Heir of the Hapsburg Realms (b.1741)
7) Miguel I, King of Spain, etc. (b. 1740) m. Maria Carolina, Archduchess of Austria (b.1741:d.1757) (a), Maria Elisabeth, Archduchess of Austria (b.1743:d.1763) (b), m. Augusta, Princess of Great Britain (b.1737) (c)
1a) Maria Isabella, Princess of Asturias (b.1757)
1b) Maria Teófila, Infanta of Spain (b.1758:d.1761)
2b) Maria Joaquina, Infanta of Spain (b.1758:d.1758)
3b) Maria Carmella, Infanta of Spain (b.1759)
4b) Maria Augusta, Infanta of Spain (b.1760)
5b) Juan, Prince of Asturias (b.1761:d.1762)
6b) Miscarried daughter (1762)
67b) Maria Henriqueta, Infanta of Spain (b.1763)
1c) Carolina, Infanta of Spain (b.1764)
2c) Carlos, Prince of Asturias (b.1766:d.1766)
3c) Maria Amalia, Infanta of Spain (b.1768)
4c) George, Prince of Asturias (b.1769)
At least 6 illegitimate children
3) Balthazar, Infante of Spain (b.1711:d.1711)
4) Stillborn daughter (1713)
5) Maria Antonia, Infanta of Spain (b.1714) m. José I, King of Portugal and the Algarves (b.1714)
1) Maria, Princess of Brazil and Duchess of Braganza (b.1734) m. Pedro, Infante of Brazil (b.1717)
1) José, Prince of Beira and Duke of Barcelos (b.1761)
2) Stillborn son (1762)
3) João, Infante of Portugal (b.1763:d.1763)
4) João, Infante of Portugal (b.1767)
5) Maria Manuela, Infanta of Portugal (b.1768)
2) Maria Ana Francisca, Infanta of Portugal (b.1734:d.1765) m. Louis, Dauphin of France (b.1729:d.1769)
1) Louis Joseph, Duke of Burgundy (b.1751:d.1768) had illegitimate children
2) Stillborn daughter (1752)
3) Xavier, Dauphin of France (b.1753) will soon marry
4) Louis August, Duke of Berry (b.1754)
5) Marie Elisabeth, Fille de France (b.1755)
6) Stillborn son (1756)
7) Louis Charles, Duke of Provence (b.1757)
8) Louis Cesar, Duke of Angoulême (b.1759)
9) Stillborn daughter (1762)
10) Stillborn daughter (1764)
11) Elisabeth, Fille de France (b.1765)
12) Louis Marcel, Count of Toulouse (b.1765)
13) Henri, Count of Artois (b.1765)
3) Stillborn son (b.1739)
4) Maria Doroteia, Infanta of Portugal (b.1739)
5) Stillborn daughter (1742)
6) Stillborn daughter (1742)
7) Stillborn daughter (1744)
8) Maria Gertrudes, Infanta of Portugal (b.1746)
6) Isabella, Infanta of Spain (b.1715:d.1769) m. Francesco II, Grand Duke of Tuscany (b.1722:d.1764)
1) Cosimo IV, Grand Duke of Tuscany (b.1747) m. Marie Zéphyrine, Fille of France (b.1750)
1) Francesca, Grand Princess of Tuscany (b.1770)
7) Stillborn son (1716)
8) Miscarried girl (1719)
9) Joseph II, Elector of Bavaria (b.1720:d.1742) m. Theresa Benedicta, Princess of Bavaria (b.1725:d.1743)
1) Ferdinand II, Elector of Bavaria (b.1743:d.1744)
10) Miscarriage (1721)
11) Miscarriage (1722)
12/13) Miguel and Ferrante, Infantes of Spain (b.1722:d. 1725)
14) Ferdinanda, Infanta of Spain (b.1723:d.1725)
15) Victoria I, Electress of Bavaria (b.1725) m. William, Duke of Cumberland, Prince Consort of Bavaria (b.1721:d.1765)
1) Ferdinand, Electoral Prince of Bavaria (b.1742) m. Christina, Princess of Denmark (b.1745)
1) Joseph, Electoral Prince of Bavaria (b.1763)
2) Rafaela, Princess of Bavaria (b.1765:d.1769)
3) Friederike, Princess of Bavaria (b.1767)
2) Joaquim, Prince of Bavaria (b.1745:d.1751)
3) Maria Augusta, Princess of Bavaria (b.1746) m. Christian VII, King of Denmark (b.1749)
1) Frederick, Crown Prince of Denmark (b.1766)
2) Stillborn son (1767)
3) Magnus, Hereditary Prince of Denmark (b.1768)
4) Maria Wilhelmina, Princess of Denmark (b.1768)
5) Miscarriage (1769)
4) Joseph, Prince of Bavaria (b.1748) m. Marie Therese, Fille de France*
16) Stillborn son (1727)
17) Stillborn son (1728)
18) Miscarriage (1730)
19) Maria Giovanna, Infanta of Spain (b.1731) m. Henry Benedict Stuart, Grand Duke of Guadalajara and Duke of Connaught (b.1725)
1) Stillborn daughter (1748)
2) Stillborn daughter (1748)
3/4) Stillborn twins (1749)
5) Miscarriage (1749)
6) Juana, Infanta of New Spain (b.1750)
7) Stillborn son (1751)
8) Henry Miguel, Infante of New Spain (b.1752)
9) Thomas, Infante of New Spain (b.1752)
10) Miscarriage (1754)
11) Maria Antonia, Infanta of New Spain (b.1755)
12) Leander, Infante of New Spain (b.13 March 1756)
13) Isidore, Infante of New Spain (b.4 April 1756)
Main things on this line
- Due to worries about legitimacy (since Carlos II was still incredibly inbred and the child didn't show the Hapsburg Jaw, in this case because of it being small enough that without really paying attention and known where to look for you wouldn't notice), when she is 6 and he is 5, Maria Isabella and Joseph Ferdinand of Bavaria are married by proxy (they redo the ceremony on the same place that Philip IV of Spain married his niece nearly 60 years before in 1708)
- The War of the Spanish Succession still occurs, lasting from 1701 to 1716, and is at the start between Maria Isabella and the OTL Philip V of Spain but after shenanigans that can be roughly boiled down to MI deposing her own mother, the pro-Austrian Maria Anna of Neuburg, at the age of 12, Holy Roman Emperor Leopold ends up abandoning her side and propping up his second son, Charles (later Holy Roman Emperor). In the end she wins and the government of Spain is more centralized (Aragon rising in rebellion and being brutally crushed helped) but they end up losing Naples (Philip) and Milan (Charles), and Maria Isabella develops a deep-seethed mistrust of both the French and the Austrians, and ends up in fact pursuing a pro-British and pro-Dutch stance due to a mix of strategy and sentimentalism (as both supported her during the entire war), and after years of slowly chipping at the sides she ends up getting royal marriages with the House of Hanover
- The Spanish Empire passes by a bunch of reforms both home and abroad (includes the Prince of Asturias being sent to learn ruling by serving as Viceroy of New Spain and the crown taking most of the power from the Church using a mix of threats (she is cozying with some of Europe's major protestant powers) and soft power)
- Gian Gastone of Tuscany, while gay, ends up having a single son out of sheer spite (he took some twisted joy in seeing that his hated father and brother would see the line of the House of Medici continue through him), and he and his wife tried to make their marriage work instead of despising each other completely.
- Due to Maximilian II Emanuel supporting the Austrian claim during the War of Succession, his first son despised him and had a barely civil relationship with his half-siblings, after Joseph's death, his second living son inherits the Electorate and is strong-armed by his half-uncle (OTL Charles VII) to marry one of his (the uncle's) daughters. Not in fact fond of his uncle, he writes on his will that in the case of him dying without heirs, the Electorate should pass to his sister (who had moved with him to Bavaria), Victoria. He has a posthumous son and Charles VII uses the him (and the fact that he still manages to get the position of Holy Roman Emperor) to disregard Victoria's claim after said posthumous son dies infancy. Because of that, at the same time that the War of the Austrian Succession is ravaging Europe, there is also an War of Bavarian Succession at the same time, which ends up in fact rekindling the relationship between the Austrian and Spanish Hapsburgs
- Cardinal-Duke Henry of York, unlike OTL, does not become a member of the clergy, and instead ends up marrying Maria Isabella's youngest daughter, Maria Giovanna, he also formally abdicates any claim he has to the British throne in the 1750s after years of negotiation (while his brother still goes on with the Jacobite Rebellions). After marrying, the couple is sent to serve as Royal Viceroys (since the Prince of Asturias can't stay in New Spain until his mother dies) and end up liking Mexico so much they decide to live there even after the end of the Viceroyship (which inspires Maria Isabella to create the new title of "Infante of New Spain" to their children) - The birth dates of the last boys of their marriage are not an error, they are the feast days of St. Leander and Isidore (brothers who lived in the 6th century Iberia), reason for their names, and are in fact a case of the rare "delayed interval delivery" a real thing that can happen in which twins are born separately (the longest time was two twin girls who were born with an interval of 87 days between them in 2012)
* She is the daughter of Louis the Dauphin from his first marriage, just as Marie Zéphyrine is his daughter from his second marriage (Maria Josepha of Saxony ended up dying in childbirth)