 Until the second half of the twentieth century almost no modern philosopher considered “information” to be an important philosophical concept. The term has no lemma in the well-known encyclopedia of Edwards (1967) and is not mentioned in Windelband (1903). In this context the interest in “Philosophy of Information” is a recent development. Yet, with hindsight from the perspective of a history of ideas, reflection on the notion of “information” has been a predominant theme in the history of philosophy. The reconstruction of this history is relevant for the study of information.