[2] Magnus lived under the Arian king Theodoric the Great, who probably at first supported him, but later persecuted him as had already happened for the philosopher Boethius.

[3] What is known is the text of his funeral epitaph, transmitted us by Goffredo da Bussero (13th century), which describes Magnus as a man of great charity who helped the prisoners of war.

The first formal survey on his relics was made in 1248 by the Dominicans who ministered to the Basilica of Sant'Eustorgio in Milan.

The main church of the town of Legnano, about 20 km (12 mi) from Milan, is dedicated to Magnus.

The Basilica di San Magno of Legnano was built between 1503 and 1513 and a part of relics of Magnus were translated there on 5 November 1900.