The Verden collegiate foundation of St. Andreas was established in 1220 by Bishop Iso of Wölpe near the parish church in close proximity to the cathedral. Its historical collection of documents is largely preserved at the Stade location of the Lower Saxony State Archives. This collection provides information about a smaller bishop-affiliated foundation in a less affluent diocese, detailing land ownership, financial transactions, and, not least, the officials and other individuals involved in legal matters. Their connections extended into the papal curia and the Council of Basel in the second half of the 15th century. The document book offers reliable copies and brief summaries of a total of 343 documents from the founding period until 1558, when the medieval conditions ended with the death of the Verden Archbishop Christoph of Brunswick-Lüneburg. Additionally, there is a historical overview.