The Abbey of St. Bertin was a Benedictine monastic abbey in Saint-Omer, France, which now in ruins that are open to the public. It was initially dedicated to St. Peter but was rededicated to its second abbot, St. Bertin. The abbey is known for its Latin cartulary whose first part is attributed to St Folquin.
The abbey was founded on the banks of the Aa in the 7th century by Bishop Audomar of Thérouanne, who is now better known as St. Omer. He sent the monks Bertin, Momelin, and Ebertram from Sithiu to proselytize among the pagans in the region. The abbey soon became one of the most influential monasteries in northern Europe and ranked in importance with Elnon and St. Vaast. Its library included the codex of the Leiden Aratea, from which two copies were made. The Annals of St Bertin are an important source of the history of 9th-century France.
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