Saint Mansuetus (died 375) was the first Bishop of Toul. He is thought to be of Irish

Ireland

Ireland is an island to the northwest of continental Europe. It is the third-largest island in Europe and the twentieth-largest island on Earth...

 or Scottish

Scotland

Scotland is a country that is part of the United Kingdom. Occupying the northern third of the island of Great Britain, it shares a border with England to the south and is bounded by the North Sea to the east, the Atlantic Ocean to the north and west, and the North Channel and Irish Sea to the...

 origin. After religious studies in 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...

, he was sent by Pope Damasus I

Pope Damasus I

Pope Saint Damasus I was the bishop of Rome from 366 to 384.He was born around 305, probably near the city of Idanha-a-Velha , in what is present-day Portugal, then part of the Western Roman Empire...

 to evangelize Gaul

Gaul

Gaul was a region of Western Europe during the Iron Age and Roman era, encompassing present day France, Luxembourg and Belgium, most of Switzerland, the western part of Northern Italy, as well as the parts of the Netherlands and Germany on the left bank of the Rhine. The Gauls were the speakers of...

, becoming the first bishop of Toul in 365.

Veneration

According to the Vita Sancti Gerardi, Bishop St. Gerard I of Toul

Gerard of Toul

Saint Gerard of Toul, also Saint Gerald of Toul was a German priest who was appointed bishop of Toul in 963. He ruled for 31 years.Unlike some other saints he was born into a very wealthy, noble family....

 (r. 963–994) had the relics of both Mansuetus and Aprus

Aprus

Saint Aprus was a bishop of Toul from 500 to 507. The brother of Saint Apronia , he was born near Trier. He may have studied as a lawyer. After entering the priesthood, Aprus was appointed bishop of Toul.-Veneration:...

 brought into Toul and placed in the church of St. John the Baptist while he was ill.

His feast day is celebrated on September 3.