Sur la distinction sénéchienne idea/idos au XIIe siècle

Based on the analysis of the Seneca΄s distinction between idea and eidos, this article represents a research concerning some comments formulated in a XIIth century manuscript from Salamanca, Apparatus super Thimeum, where this distinction it is resumed. My thesis is that Seneca΄s distinction and the five cause's theory assure essential roots for the horizon of the XIIth thought.