Antoninus Pius at English => English (The Britannica Concise) Of Explained:
Roman emperor (AD 138-61). Of Gallic origins, he served as consul (120) before being assigned judicial administrative duties in Italy. He later governed the province of Asia (c.134). He became an adviser to Hadrian, and in 138 was made Hadrian's heir. On accession, he had the deceased emperor declared a god; for such dutiful acts he was named Pius ("pious"). He quelled rebellions in Britain and in other provinces and built the Antonine Wall.