CAESAR TITVS AELIVS HADRIANVS ANTONINVS AVGVSTVS PIVS
Born: September 19, 86 AD, Near Lanuvium, Italia
Reigned: July 10, 138 AD - March 7, 161 AD
Adopted son and heir of Hadrian
Died: March 7, 161 AD Natural causes

Titus Aurelius Fulvus Boionius Arrius Antoninus (19 September, 86–7 March 161), generally known in English as Antoninus Pius was Roman emperor from 138 to 161. He was the fourth of the Five Good Emperors and a member of the Aurelii. He did not possess the sobriquet "Pius" until after his accession to the throne. Almost certainly, he earned the name "Pius" because he compelled the Senate to deify his adoptive father Hadrian; the Historia Augusta, however, suggests that he may have earned the name by saving senators sentenced to death by Hadrian in his later years.

He was the son and only child of Titus Aurelius Fulvus, consul in 89 whose family came from Nemausus (modern Nîmes) and was born near Lanuvium and his mother was Arria Fadilla. Antoninus’ father and paternal grandfather died when he was young and he was raised by Gnaeus Arrius Antoninus, his maternal grandfather, a man of integrity and culture and a friend of Pliny the Younger. His mother married to Publius Julius Lupus (a man of consular rank), Suffect Consul in 98, and bore him a daughter called Julia Fadilla.

As a private citizen between 110–115, he married Annia Galeria Faustina the Elder. They had a very happy marriage. She was the daughter of consul Marcus Annius Verus and Rupilia Faustina (a half-sister to Roman Empress Vibia Sabina). Faustina was a beautiful woman, renowned for her wisdom. She spent her whole life caring for the poor and assisting the most disadvantaged Romans.