Elisabeth of Schönau, Saint. [Letter to Gerlach, the abbot of Deutz and his brothers] in Die Visionen und Briefe der heiligen Elisabeth 6.141

[Letter from Elisabth of Schönau to Gerlach, the abbot of Deutz and his brothers]
An admonition to Gerlach to see to the spiritual welfare of his flock and an oblique reference to the cult of the Cologne martyrs, a large graveyard discovered outside Cologne in 1156 containing the bones of St. Ursula and the 11,000 virgin martyrs, some of which were sent to Elisabeth for identification.
Online at Epistolae (See also Bibliographia record).