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After the marriage of Maximilian I with Mary, heiress of Burgundy (the Low Countries) and the marriage of his son Philipp the Handsome with Juana, heiress of Spain and its newly-founded empire, Charles V inherited an empire where "the sun does not set".
Upon the abdication of the Emperor Charles V, also King Charles I of Spain (1516 - 1556), the family split into the Austrian Habsburgs and the Spanish Habsburgs.
The Spanish Habsburgs died out in 1700 (prompting the War of the Spanish Succession), as did the Austrian Habsburgs in 1740 (prompting the War of the Austrian Succession). However, the heiress of the last Austrian Habsburg (Maria Theresa) had married Francis Stephen Duke of Lorraine, and their descendants carried on the Habsburg tradition from Vienna under the dynastic name Habsburg-Lorraine. It is speculated that extensive intra-family marriages within both lines contributed to their extinctions.
In 1806 the Holy Roman Empire was wound up under the French Emperor Napoleon I's reorganisation of Germany. However, in anticipation of the loss of his title of Holy Roman Emperor, Francis II declared himself hereditary Emperor of Austria in 1806, two years after Napoleon declared himself Emperor of France in 1804. (The dates are a bit doubtful here.)
Emperor Francis I of Austria used the official great title: "We, Francis the First, by the grace of God Emperor of Austria; King of Jerusalem, Hungary, Bohemia, Dalmatia, Croatia, Slavonia, Galicia, and Lodomiria; Archduke of Austria; Duke of Lorraine, Salzburg, Würzburg, Franconia, Styria, Carinthia, and Carniola ; Grand Duke of Cracow; Prince of Transylvania; Margrave of Moravia; Duke of Sandomir, Masovia, Lublin, Upper and Lower Silesia, Auschwitz and Zator, Teschen, and Friule; Prince of Berchtesgaden and Mergentheim; Princely Count of Habsburg, Gorizia, and Gradisca and of the Tyrol; and Margrave of Upper and Lower Lusatia and Istria".
Hungary, nominally under Habsburg kingship from 1526 but mostly under Ottoman Turkish occupation for 150 years, was reconquered in 1683 - 1699. In 1867 effective autonomy was given to Hungary under the terms of the Ausgleich - "compromise" (see Austria-Hungary) until the Habsburgs' deposition from both Austria and Hungary in 1918 following defeat in World War I.
Habsburg
Holy Roman Emperors of the House of Habsburg
NB: Maria Theresa of Austria, Habsburg heiress and wife of emperor Francis I Stephen, reigned as Archduchess of Austria and Queen of Hungary and Bohemia 1740 - 1780
Habsburg-Lorraine (Lothringen) Emperors