ENWho were the former owners of Riga Jesuit college library’s books? What is the significance of the Riga Jesuit college heritage in Latvia’s cultural history? What was the fate of the Riga Jesuit college book collection? The results of the bibliographic research I will present will reveal the difficulties of identifying books and provenances in the Riga Jesuit college book collection. In this study, I will show the complicated historical circumstances in which the book collection was formed and which affected its ultimate fate.