Hadrian was Roman emperor from 117 to 138 CE and he is known as the third of the Five Good Emperors (Nerva, Trajan, Hadrian, Antoninus Pius, and Marcus Aurelius) who ruled justly. Born Publius Aelius Hadrianus, probably in Hispania, Hadrian is best known for his substantial building projects throughout the Roman Empire and, especially, Hadrian’s Wall in northern Britain.