Saint Sixtus of Reims (d. ca. 300 AD) is considered the first bishop of Reims. According to Hincmar, a 9th century archbishop of Reims, Sixtus was sent from Rome by Pope Sixtus II

Pope Sixtus II

Pope Sixtus II or Pope Saint Sixtus II was Pope from August 30, 257 to August 6, 258. He died as a martyr during the persecution by Emperor Valerian....

 to 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...

 to assist in Christianizing the region. Another tradition makes him, anachronistically, the disciple of Saint Peter

Saint Peter

Saint Peter or Simon Peter was an early Christian leader, who is featured prominently in the New Testament Gospels and the Acts of the Apostles. The son of John or of Jonah and from the village of Bethsaida in the province of Galilee, his brother Andrew was also an apostle...

.
According to tradition, Sixtus of Reims, along with his companion St. Sinicius (Sinice), established the Christian sees of Reims

Reims

Reims , a city in the Champagne-Ardenne region of France, lies east-northeast of Paris. Founded by the Gauls, it became a major city during the period of the Roman Empire....

 and Soissons

Soissons

Soissons is a commune in the Aisne department in Picardy in northern France, located on the Aisne River, about northeast of Paris. It is one of the most ancient towns of France, and is probably the ancient capital of the Suessiones...

. Sinicius would later succeed Sixtus as bishop of Reims. According to one source, “it would appear that Sixtus did not die as a martyr, despite the severity of the persecution during the era.”