English summary: Within the span of a single century (from the mid-15th to the mid-16th centuries), the Greek language, which was well on its way to oblivion, became the focus of one of the most heated debates of the Renaissance period. Greek was accused by what was then a Catholic and Latin Europe of being a vehicle for ancient paganism, Byzantine schism, and even Lutheran heresy. The Council of Trent, which deemed that Roman authority was being undermined by the Vulgate's philological criticism, went so far as to confirm the obvious collusion that existed between Greek and heresy. In fact, behind such accusations can be discerned the power struggles that were taking place between ecclesiastical, academic and political factions. Analysis of such confrontations and of the difficulties that Humanists had in circumventing them, infers that, despite its ultimate success, Greek literature remained suspect in Europe throughout the Counter-Reformation. In this very meticulous study, based on previously unpublished texts, of what was at stake in this anti-Greek movement (a resistance actually based on free, progressive and critical thought), the author combines the thoroughness of an historian with a mine of true anecdotes about the moral standards of that era: the censure practices, legal disputes, self-serving denouncements, etc. That, indeed, were the most evident driving forces behind the intellectual and power struggles. French description: Le grec, disparu d'Europe depuis les Grandes Invasions, fit un retour spectaculaire au XVe siecle. Mais l'enthousiasme des humanistes pour la langue d'Homere a fait oublier la violence des resistances que lui opposerent les maitres scolastiques. Lorsque Erasme osa contester la Vulgate latine au nom de la verite grecque (1516), le scandale eclata publiquement et Luther en prit argument pour contester l'autorite de Rome, si bien que les hellenistes furent accuses de faire le jeu de la Reforme. Le statut du grec se vit etroitement lie a celui de l'hebreu, l'autre langue sacree rivale du latin (l'Affaire Reuchlin). Pour extirper le mal a sa racine, le concile de Trente decida finalement d'imposer la legitimite du latin biblique (1545) et d'interdire l'acces aux sources grecques et hebraiques, puis de mettre a l'index les principaux hellenistes et leurs imprimeurs. Les etudes grecques allaient en rester durablement affaiblies dans l'Europe de la Contre-Reforme. En faisant revivre les oeuvres et les hommes qui en furent les acteurs, et en devoilant ses veritables enjeux, ce livre retrace les deux siecles de cette bataille du grec, restee un point aveugle dans l'histoire de la culture occidentale. Jean-Christophe Saladin est docteur en Histoire.