Gesta Treverorum

The Gesta Treverorum (Deeds of the Treveri) is a collection of histories, legends, wars, records of the Archbishops of Trier, writings of the Popes, and other records that were collected by the monks of the St. Matthias Abbey in Trier. It was begun in the 12th century and was continued until 1794 when the Archbishopric of Trier came to an end. An edition was published as an eight-volume set in the 19th century. A new 8-volume edition by Emil Zenz was published in the 1950s and 1960s.

...
Wikipedia