The House of Habsburg (; ), also spelled Hapsburg, was one of the most important 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 kings of Bohemia, England, Germany, Hungary, Croatia, Ireland, Portugal, and Spain, as well as rulers of several Dutch and Italian countries.
The House takes its name from Habsburg Castle, a fortress built in the 1020s in present-day Switzerland by Count Radbot of Klettgau, who chose to name his fortress Habsburg. His grandson, Otto II, was the first to take th...