The House of Habsburg, also called House of Austria, was one of the most influential and outstanding royal houses of Europe. The throne of the Holy Roman Empire was continuously occupied by the Habsburgs between 1438 and 1740. The house also produced emperors and kings of the Kingdom of Bohemia, Kingdom of England ("Jure uxoris" King), Kingdom of Germany, Kingdom of Hungary, Kingdom of Croatia, Second Mexican Empire, Kingdom of Ireland ("Jure uxoris" King), Kingdom of Portugal, and Spain, as well as rulers of several Dutch and Italian principalities. From the 16th century, following the reign of Charles V, the dynasty was split between its Austrian and Spanish branches. Although they ruled distinct territories, they nevertheless maintained close relations and frequently intermarried. 

The House takes its name from Habsburg Castle, a fortress built in the 1020s in present-day Switzerland, in the canton of Aargau, by Count Radbot of Klettgau, who chose to name his fortress Habsburg. His grandson Otto II was the first to take the fortress name as his own, adding "Count of Habsburg" to his title. The House of Habsburg gathered dynastic momentum through the 11th, 12th, and 13th centuries. 

By 1276, Count Radbot's seventh generation descendant Rudolph of Habsburg had moved the family's power base from Habsburg Castle to the Duchy of Austria. Rudolph had become King of Germany in 1273, and the dynasty of the House of Habsburg was truly entrenched in 1276 when Rudolph became ruler of Austria, which the Habsburgs ruled until 1918.
Where is the House of Habsburg?
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Who decided to make Habsburg part of his name?
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most influential and outstanding royal houses of Europe
most influential and outstanding royal houses of Europe
Europe
Europe
House of Austria
also called House of Austria
Habsburg Castle
The House takes its name from Habsburg Castle
Switzerland
Switzerland
canton of Aargau
canton of Aargau
Count Radbot of Klettgau
Count Radbot of Klettgau
yes
his fortress Habsburg.
1020s
fortress built in the 1020
Otto II
 His grandson Otto II was the first to take the fortress name as his own, adding "Count of Habsburg"
His grandson
His grandson Otto II
adding "Count of Habsburg
adding "Count of Habsburg
Rudolph of Habsburg
Count Radbot's seventh generation descendant Rudolph of Habsburg had moved the family's power base from Habsburg Castle to the Duchy of Austria. 
Count Radbot's seventh generation descendant
Count Radbot's seventh generation descendant
Duchy of Austria
from Habsburg Castle to the Duchy of Austria
1276
Rudolph had become King of Germany in 1273, and the dynasty of the House of Habsburg was truly entrenched in 1276 
yes
Rudolph had become King of Germany in 1273
Germany
 King of Germany in 1273
1273
become King of Germany in 1273
Austria
1276 when Rudolph became ruler of Austria