Frederick III, Holy Roman Emperor (d. 1493)
Frederick III (21 September 1415 – 19 August 1493) was Holy Roman emperor from 1452 until his death. He was the fourth king and 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 from 1439. He was elected and crowned King of Germany in 1440. His reign of 53 years is the longest in the history of the Holy Roman Empire or the German Monarchy. Upon his death in 1493 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 effective ruler.

Historian Thomas A.Brady Jr. credited Frederick with leaving a credible claim on the imperial title and a secure grip on the Austrian lands, now organized as a single state, for his son. This imperial revival (as well as the rise of the territorial state) began under the reign of Frederick.