Antoninus Pius (Latin: Titus Fulvius Aelius Hadrianus Antoninus Augustus Pius; born 19 September, 86 AD – died 7 March, 161 AD), also known as Antoninus, was Roman Emperor from 138 to 161. He was a member of the Nerva-Antonine dynasty and the Aurelii. He acquired the name Pius after his accession to the throne, either because he compelled the Senate to deify his adoptive father Hadrian, or because he had saved senators sentenced to death by Hadrian in his later years. He was named as the fourth of the "Five Good Emperors" by 18th-century English historian Edward Gibbon.