In his book "Orientalism" (1978), cultural critic Edward Said redefines the term "Orientalism" to describe a pervasive Western tradition—academic and artistic—of prejudiced outsider-interpretations of the Eastern world, which was shaped by the cultural attitudes of European imperialism in the 18th and 19th centuries. The thesis of "Orientalism" develops Antonio Gramsci's theory of cultural hegemony, and Michel Foucault's theorisation of discourse (the knowledge-power relation) to criticise the scholarly tradition of Oriental studies. Said criticised contemporary scholars who perpetuated the tradition of outsider-interpretation of Arabo-Islamic cultures, especially Bernard Lewis and Fouad Ajami.