Erasmus was a prolific writer and that is why the demand for an overview of his work was high. Dirk Martens published a short bibliography in 1519. Four years later, Erasmus created an overview himself in a letter to a humanist friend. This letter was then published. The main focus was on taxonomy and textual coherence, and not so much on bibliographic accuracy. The list later served as a guideline for the publication of Erasmus’ collected works.