

For naming conventions, see Medieval Kingdoms of Western Europe.
The House of Habsburg, often Anglicised as Hapsburg and sometimes referred to as the House of Austria, was one of the most important royal houses of Europe and is best known for being an origin of all of the formally elected Holy Roman Emperors between 1438 and 1740, as well as rulers of the Austrian and Spanish Empires and several other countries. Originally from Switzerland, the dynasty first reigned in Austria, which they ruled for over six centuries. A series of dynastic marriages brought Burgundy, Spain, Bohemia, Hungary, and other territories into the inheritance. In the 16th century, the family separated into the senior Habsburg Spain and the junior Habsburg Austrian branches, who settled their mutual claims in the Oñate treaty.