Frederick III of Habsburg is the last Holy Roman Emperor crowned by medieval tradition in Rome by Pope Nicholas V.

Frederick III was Holy Roman Emperor from 1452 until his death in 1493. He was the penultimate emperor to be crowned by the pope, and the last to be crowned in Rome. He was the fourth King of the Romans and the first Holy Roman Emperor from the House of Habsburg, which was to retain the title with one gap until it was declared at an end by Emperor Francis II, in 1806.

The Holy Roman Emperor, originally and officially the Emperor of the Romans during the Middle Ages, and also known as the Roman-German Emperor since the early modern period, was the ruler and head of state of the Holy Roman Empire. The title was held in conjunction with the title of King of Italy from the 8th to the 16th century, and, almost without interruption, with the title of King of Germany throughout the 12th to 18th centuries.

Pope Nicholas V, born Tommaso Parentucelli, was head of the Catholic Church and ruler of the Papal States from 6 March 1447 until his death in March 1455. Pope Eugene IV made him a cardinal in 1446 after successful trips to Italy and Germany, and when Eugene died the next year, Parentucelli was elected in his place. He took his name Nicholas in memory of his obligations to Niccolò Albergati. He remains the most recent pope to take the pontifical name "Nicholas".

March 19 is the 78th day of the year in the Gregorian calendar; 287 days remain until the end of the year.