Résumé :
Abstract The manuscript tradition of the twofold treatise “On Psychic Pneuma” by the late Byzantine Aktouarios John Zacharias is divided in two significantly different redactions (x and y) demonstrating separate levels of this treatise’s transmission and reception. Although both redactions most probably depend on one single textual witness, Parisinus gr. 2098, they visualize diverse terms of intention, literary value, and formal aspects. This paper analyses different approaches of the treatise’s contextualisation within the manifold ambience of Byzantine medicine.