Antoninus Pius was a Roman Emperor who ruled from 138 to 161 AD. He is known for his peaceful reign, which was marked by stability and prosperity in the Roman Empire. Antoninus Pius focused on administrative efficiency and legal reforms, enhancing the welfare of his citizens. Born in 86 AD, he was adopted by Emperor Hadrian, who recognized his capabilities. Antoninus Pius is often remembered for his dedication to the arts and architecture, as well as for building the Antonine Wall in Britain. His reign is considered one of the "Five Good Emperors," a period of relative peace and good governance.