"Rudolf I, also known as Rudolf of Habsburg (German: Rudolf von Habsburg, Czech: Rudolf Habsburský; 1 May 1218 – 15 July 1291), was Count of Habsburg ...
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from about 1240 and King of Germany from 1273 until his death.
Rudolf´s election marked the end of the Great Interregnum in the Holy Roman Empire after the death of the Hohenstaufen emperor Frederick II in 1250. Originally a Swabian count, he was the first Habsburg to acquire the duchies of Austria and Styria in opposition to his mighty rival, the Přemyslid king Ottokar II of Bohemia, whom he defeated in the 1278 Battle on the Marchfeld. The territories remained under Habsburg rule for more than 600 years, forming the core of the Habsburg Monarchy and the present-day country of Austria." - (en.wikipedia.org 08.11.2019)
