Saint Arsatius or Arsacius is a saint of whose life virtually nothing is known. He is said to have been a bishop of Milan

Milan

Milan is the second-largest city in Italy and the capital city of the region of Lombardy and of the province of Milan. The city proper has a population of about 1.3 million, while its urban area, roughly coinciding with its administrative province and the bordering Province of Monza and Brianza ,...

, who lived either around 400 or in the 6th century, and possibly a martyr, but there is no evidence. Because of the traditional connection with Milan, he is further supposed to have been a disciple of Saint Ambrose

Ambrose

Aurelius Ambrosius, better known in English as Saint Ambrose , was a bishop of Milan who became one of the most influential ecclesiastical figures of the 4th century. He was one of the four original doctors of the Church.-Political career:Ambrose was born into a Roman Christian family between about...

, who was also Bishop of Milan, but there is no evidence of this either.

His relics were brought in 766 from Rome

Rome

Rome is the capital of Italy and the country's largest and most populated city and comune, with over 2.7 million residents in . The city is located in the central-western portion of the Italian Peninsula, on the Tiber River within the Lazio region of Italy.Rome's history spans two and a half...

 to Ilmmünster Monastery where a cultus grew up around them and where the well-known Arsatius-Basilika is still dedicated to him. They were moved to Munich

Munich

Munich The city's motto is "" . Before 2006, it was "Weltstadt mit Herz" . Its native name, , is derived from the Old High German Munichen, meaning "by the monks' place". The city's name derives from the monks of the Benedictine order who founded the city; hence the monk depicted on the city's coat...

in 1495, but returned to Ilmmünster in 1846. His feast day is 12 November.