Eustorgius was perhaps buried in the cemetery on the grounds of Sant'Eustorgio, which was located outside the Roman walls along the road to Pavia.

For September 18, the Roman Martyrology states: "At Milan, St. Eustorgius I, Bishop of that city, rendered by the testimony of blessed Ambrose.

[6] His legend states that in 344, he brought the relics of the Three Magi from Constantinople to Milan, with two small cows which transported a large sarcophagus of marble.

300 AD) The relics[7] of the Magi - Stefan Lochner paints a picture in 1445[8] - were taken from Milan by Holy Roman Emperor Fredrick Barbarossa and given to the Archbishop of Cologne, Rainald of Dassel, in 1164.

[9] A Shrine of the Three Kings at Cologne Cathedral still exists (a part of these relics were returned to the Basilica of Sant'Eustorgio of Milan in 1904)[10] The Vita Beati Eustorgii Confessoris reports around the year 1200: "...

The holy Helena, mother of the emperor Constantine, was one with all virtues affected and a very much pious woman regarding the Christian religion.

At that time Eustorgius lived, Greek birth, a very informed man, nobly and piously, of pleasing exterior, eloquently, for the service to God quite been suitable and in this service turned, a guard of the faith, and also chaste, and a native from Constantinople, before the times of bishop Saint Ambrose of Milan.

Thus Eustorgius went pleased, and he manufactured a marmorean coffin with large effort, and put into it the bodies of the Three Kings, who had brought Christus their gifts - gold, frankincense and myrrh.

The sarcophagus became buried outside of the city-wall closely beside the city in a church, which later was sanctified to honor holy Eustorgius.