Several libraries from Transylvania hold in their historical collections works written by an important figure of the early modern Catholicism, Johannes Eck (1486-1543). The present paper looks at the volumes of this author, printed in the first half of the sixteenth century, paying special attention to sermon collections, prevalent among the books found in Transylvania. Their number is rather small, but the analysis of ownerships marks allows formulating some observations. Thus, the bibliographic component of the study, which identifies the preserved volumes, some of which have not been cataloged so far, is accompanied by a historical approach that questions the context of their reception. With a few exceptions, in which the the clues about ownership and the use of books are either missing or very late, Eck''''s works seem to have been circulated both during the dissemination of the ideas of the Reformation and after the adoption of the new denominations.

Keywords: sermon collections, Reformation, Johannes Eck, Mediascher Predigtbuch, franciscan mission