This article has two objectives. Firts, it is my aim to outline some medieval views concerning the acts that oppose one's better judgment. I will use Aristotle's term aktasia to denote the moral state of an agent behaving in this way. John Burdidan's (1285-1349) treatment of akrasia is especially relevant here. Second, it will be argued that some important philosophical ideas proposed receently by Donald Davidson, in his influential study 'How is Waekness of the Will Possible?', are anticipated in the (...) medieval discussion. (shrink)