As per tradition the kingdoms of Austria and Bohemia are held in personal union. Bohemia's crown dates (officially) from 1212. Austria's a more recent 1898.
Austria was originally a march (margraviate) within Bavaria.
The 1156 Prviliegium Minus elevates the March to a Duchy, making it independent of Bavaria.
After Frederick's death Austria is disputed between various claimants, the longest lasting being Ottokar II of Bohemia (1251-1278). He is eventually defeated by Emperor Rudolph I who would divide his lands between his sons.
Albert's three sons divide the duchy (the title of Archduke was a 1359 fabrication which was only confirmed in 1513 when Austria was reunited). The death of his cousins without heirs allows Sigismund, duke of Inner Austria, to reunite the lands over the course of his rule.
Emperor Frederick VI
Emperor Charles VI
Emperor Rudolph II
Emperor Rudolph III
After much bartering in the Imperial Diet the title of King of Austria is finally bestowed on the Archdukes in 1898, though this came with the provision, occasionally contested, that they should not pursue an additional electorate for Austria.
Emperor Charles VIII
The Kings of Bohemia are usually dated from 1212 when the title was confirmed by the Sicilian Bull, though an illustrious line of Dukes stretches back to the early 9th century. Previous dukes did claim the title of king however it was not a hereditary title.
|Henry I||(1306, 1307-1310)|
John of Luxembourg marries Elizabeth, the last heir of Wenceslaus II.
Emperor Charles IV
Emperor Sigismund I
Emperor Sigismund II
Emperor John I
|Henry II of Prague|
Queen Joanna as regent
The death of Henry of Prague before he can reach his majority gives the Bohemian magnates, an opportunity to break with Luxembourg rule. Maximilian II of Austria is elected. From that date the King of Bohemia is also Archduke of Austria.