The name Habsburg takes its name from Habsburg Castle, built in 1020 in present-day Switzerland.
The House of Habsburg was one of the most influential royal houses of Europe. It occupied Holy Roman Empire throne between 1438 and 1740. It included emperors and kings of Bohemia, England, Germany, Hungary, Croatia, Second Mexican Empire, Ireland, Portugal, and Spain.
In the sixteenth century, the dynasty was split between its Austrian and Spanish branches. The House ended in the 18th century. The Spanish branch ended upon the death of Charles II of Spain in 1700 and was replaced by the House of Bourbon. The Austrian branch became extinct with the death of Holy Roman Emperor Charles VI in 1740 and with the death of his daughter Maria Theresa of Austria in 1780.
The successor House of Lorraine styled itself formally as the House of Habsburg-Lothringen, and still referred to as the House of Habsburg and ruled until 1918.