Wagner’s project for the Festspielhaus in Bayreuth also established ‘the Bayreuth idea’, in which festival visitors were to participate directly in the performances. Initially, an explicit separation of art and politics anchored this separation, yet later ideologies came to influences the Bayreuth circle, and in turn, the Festival itself. Two are examined in this chapter, Houston Stewart Chamberlain (in relation to Cosima), and Adolf Hitler (in relation to Winifred), alongside the Festival in the aftermath of the Second World War.