Pius is believed to have been born at Aquileia, in Northern Italy, during the late 1st century. His father was an Italian called "Rufinus", who was also a native of Aquileia according to the Liber Pontificalis. According to the 2nd century Muratorian Canon and the Liberian Catalogue, he was the brother of Hermas, author of the text known as The Shepherd of Hermas. The writer of the...