Hierarch St. Prosper, Bishop of Reggio

DATE CLARIFICATION: the date June 12/25, superficially similar to Prosper of Aquitaine's "June 25 O.S.," research showed this coincidence to be genuine, not contamination: St. Prosper of Reggio's date derives from the New Style Western calendar (June 25 N.S. = June 12 O.S.), whereas Venerable Prosper of Aquitaine's date in sources is already given as Old Style (June 25 O.S.) — meaning these are DIFFERENT absolute days despite the matching number. A local commemoration on November 11/24, observed within the Reggio diocese itself, has also been retained (general church veneration was restricted to this diocese by the Council of Trent).

St. Prosper held the episcopal see of Reggio Emilia (northern Italy) for twenty-two years in the 5th century — an era of profound upheaval as the Western Roman Empire disintegrated under barbarian pressure. Few personal details of his life survive, but his episcopate is firmly attested documentarily.

He was especially remembered for his charity toward the city's poor and for building a cathedral dedicated to St. Apollinaris of Ravenna — a church later renamed in his own honor (the Basilica of San Prospero) after his relics were translated there in 703, alongside those of Sts. Venerius, Cosmas, and Damian. He died around 466 and was soon venerated as patron of Reggio; his cult especially flourished in the 11th-14th centuries across Emilia-Romagna (Parma, Bologna, Lucca) — some 31 medieval churches were dedicated to him — before the Council of Trent restricted his liturgical veneration to the Reggio diocese.