The University Library Mainz bought the Brentano Collection in 1953/54 from the Pattloch bookshop in Aschaffenburg. The collection comprises correspondence, manuscripts, poems and other documents by Clemens Brentano as well as letters of his family members; particularly by Bettina von Arnim and Sophie (Mereau-)Brentano. A survey of the collection’s documents may be viewed in the Kalliope Portal.