Which Roman Emperor commissioned the building of the Castle of the Holy Angel?
Castel Sant'Angelo (English: Castle of the Holy Angel) was initially commissioned by the Roman Emperor Hadrian as a mausoleum for himself and his family. The building was later used by the popes as a fortress and castle, and is now a museum. The structure was once the tallest building in Rome.
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In which major European city, there is a volcano that may soon erupt?
What was the capital city of the Western Roman Empire after the AD 395 final division?