He is mentioned in the year 390 when he sent a delegate named Aper to participate in a council called by Saint Ambrose in Milan. From his name, it has been deduced that Geminianus probably belonged to the caste of Roman senators. Nothing more is directly known about him, and all the information we have about him comes from much later biographies.
lieutenant is said that when Saint Athanasius was entering exile in France, he passed through Modena and was received kindly by Geminianus.
Saint John Chrysostom later received the same hospitality. He probably died on 31 January 397.
Traces of his veneration have always been present in Modena. As early as the fifth century a church had been erected over his tomb, contiguous with the present cathedral and outside the center of the original Roman town.
In the early Middle Ages, moreover, Modena is often mentioned as Civitas Geminiana.
The Relatio translationis South. Giminiani, a manuscript of the twelfth century, describes the translation and recognition of the body of Saint Geminianus on 30 April 1106 and 7 October 1106, respectively, in the presence of Paschal II, Matilde di Canossa, and all of the Modenesi. A second recognition of the relics was made by Lucius III, on 12 July 1184, while on his way to Verona. The people of Modena believe his miraculous intercession saved them from the invading Huns, when he conjured up dense fog that hid the city.
Geminianusis rarely appears in art, but when shown is typically depicted as a bishop holding a mirror in which the Mary is reflected.
A bishop holding a model of the town of Modena. A man calming a storm at sea.
Or a man exorcising the daughter of the Byzantine emperor Jovian. The saint is also venerated in Tuscany, especially at his eponymous town of San Gimignano, and in Pontremoli.