Primo, together with his brother Feliciano, suffered martyrdom under the persecutions of Diocletian and Maximian. Their bodies were among the first to be transferred, to be taken to S. Stefano Rotondo, on Mount Celio, where they are also remembered by a mosaic, which depicts them in military clothing. Saint Primo was a patrician beheaded on the St. Nomentana in 29; his body was buried at the XV mile of the St. Labicana.

Tales of the statue in Dome’s building site:

The statue of Saint Primo that stands out on the G86 spire is probably a work by Luigi Casareggio made in the early 1800s, as also attested by a note found in the annals of Veneranda Fabbrica, which states the payment to the sculptor following the creation of a statue intended for a spire. The statue represents a young man with his body upright and his head turned in the direction of the square. He wears a drapery that partially covers him while his long, wavy hair falls on his shoulders, giving harmony to his concentrated expression as he scans the horizon.