From the 15th century onward, all Holy Roman Emperors but one were Austrian archdukes and with the acquisition of the Bohemian and Hungarian crown lands in 1526, the Habsburg hereditary lands became the centre of a major European power.
Starting from the 15th century, every Holy Roman Emperor but one was an Austrian archduke.  The Habsburgs' expansion in 1526 solidified their control over Bohemian and Hungarian territories, making them a dominant force in Europe.