Frederick III was Holy Roman Emperor from 1452 until his death, the first emperor of the House of Habsburg. He was the penultimate emperor to be crowned by the Pope, and the last to be crowned in Rome.
Prior to his imperial coronation, he was duke of the Inner Austrian lands of Styria, Carinthia and Carniola from 1424, and also acted as regent over the Duchy of Austria (as Frederick V) from 1439. He was elected and crowned King of Germany (as Frederick IV) in 1440. He was the longest-reigning German monarch when in 1493, after ruling his domains for more than 53 years, he was succeeded by his son Maximilian I.
During his reign, Frederick concentrated on re-uniting the Habsburg "hereditary lands" of Austria and took a lesser interest in Imperial affairs. Nevertheless, by his dynastic entitlement to Hungary as well as by the Burgundian inheritance, he laid the foundations for the later Habsburg Empire. Mocked as "Arch-Sleepyhead of the Holy Roman Empire" (German: Erzschlafmütze) during his lifetime, he is today increasingly seen as an efficient ruler.