Abstract
Aristotle Middle Commentary on the Topics, comparing them, where necessary, to the testimonies collected by Boethius in his De topicis differentiis. In addition we show that the Themistian classification of loci was taken up by Abt al-Badb al-mub al-mu al-Barak thus reveals himself to be closer than Averroes to the testimony of Boethius. This suggests the idea of a double redaction by Themistius of the classification of loci: one, more concentrated, comes from an introduction to the paraphrase of the central books of the Topics, which may have inspired Averroes; the other, more extensive, which will have been part of an original work, and inspired the classifications of Boethius and of Abt al-Badī