The House of Austrian Habsburgs came into being after the April 21, 1521 assignment of the Austrian lands to Ferdinand I from his brother Emperor Charles V (also King Charles I of Spain) (1516 - 1556). This split the Habsburg family into the Spanish Habsburgs and the Austrian Habsburgs. The Austrian Habsburgs held (after 1556) the title of Holy Roman Emperor, as well as the Habsburg Hereditary Lands and the Kingdoms of Bohemia and Hungary.
After the April 21, 1521 assignment of the Austrian lands to Ferdinand I from his brother Emperor Charles V (also King Charles I of Spain) (1516 - 1556), the family split into the AustrianHabsburgs and the Spanish Habsburgs.
The AustrianHabsburgs held (after 1556) the title of Holy Roman Emperor, as well as the Habsburg Hereditary Lands and the Kingdoms of Bohemia and Hungary, while the Spanish Habsburgs ruled over the Spanish kingdoms, the Netherlands, the Habsburgs' Italian possessions, and, for a time, Portugal.
However, the heiress of the last AustrianHabsburg (Maria Theresa) had married Francis StephanDuke of Lorraine, (both of them were great-grandchildren of Habsburg Emperor Ferdinand III, but from different empresses) and their descendants carried on the Habsburg tradition from Vienna under the dynastic name Habsburg-Lorraine.