_ Source: _Volume 55, Issue 4, pp 307 - 339 This article puts forward an analysis of the theory of signs contained in the _Prodidagmata ad logicam Aristotelis_, a compendium on logic written by the Flemish philosopher and Louvain professor Laurentius Ghiffene. Focusing on Ghiffene’s definition and division of a sign and his account of the problem of self-reference, the author argues that Ghiffene positioned himself in the tradition of the Conimbricenses and relied extensively on their influential commentary on Aristotle’s (...) _Organon_, published in 1606. The aim of the present contribution is to shed new light on the teaching of logic at Louvain during the years immediately preceding the rise of modern philosophy, an episode in the university’s history which remains almost entirely unstudied. (shrink)