:Hello, by here [] austria became a duchy in 1156, and gets recognized as a archduchy in 1457. The artice says "The archduchy however was not formally recognized until Ernest's son Frederick V was elected Holy Roman Emperor and the Habsburgs gained control of the office to legitimate their usurpation in 1453" but there's no source, so I think the date of 1457 is the correct. btw in the mean time i corrected the infoxbox that is undoubtful wrong.