_ Source: _Volume 54, Issue 4, pp 255 - 285 This paper examines the authorship and reception of the medieval translation of Sextus Empiricus’ _Outlines of Pyrrhonism_. It is shown that its traditional ascription to Niccolò da Reggio cannot be maintained, because the translation must have circulated already in the late 1270s. Its author is difficult to identify: the closest stylistic parallels are found with the anonymous translator of Aristotle’s _De partibus animalium_. With Alvaro of Oviedo and the otherwise unknown (...) Johannes de Peretis two early readers can be named. Though a copy was accessible in Viterbo at this time and another copy possibly travelled around in Italy in the 1320s, no philosophical or other impact can be determined. A single reference is found in Peter of Auvergne’s _Quaestiones_-commentary on Aristotle’s _Politics_. Its origin is difficult to assess. (shrink)