Upon opening a copy of the 1572 Venetian edition of Natale Conti’s Historiarum sui temporis libri decem, the ex-libris caught the attention of Dr. Nina Lamal. Opposite the title page of the book there was an engraved portrait of Alvarus Nonnius by Jan Wierix, dated 1586. In the following weeks, she came across the same portrait pasted in several other books in the Hendrik Conscience Heritage Library. Her interest was piqued: she wanted to reconstruct Nonnius’ library and investigate how his books became part of the collection of the Conscience library. This short blog offers the first results of that quest.