The German philosopher and historian Ernst Nolte, starting in the 1980s, advanced a set of theories, which though not denying the Holocaust appeared to flirt with an Italian Holocaust denier, Carlo Mattogno, as a serious historian. In a letter to the Israeli historian Otto Dov Kulka of December 8, 1986, Nolte criticized the work of the French Holocaust denier Robert Faurisson on the ground that the Holocaust did occur, but went on to argue that Faurisson's work was motivated by what Nolte claimed were the admirable motives of sympathy towards the Palestinians and opposition to Israel. In his 1987 book "Der europäische Bürgerkrieg" ("The European Civil War"), Nolte claimed that the intentions of Holocaust deniers are "often honourable", and that some of their claims are "not obviously without foundation". Nolte himself, though he has never denied the occurrence of the Holocaust, has claimed that the Wannsee Conference of 1942 never happened and that the minutes of the conference were post-war forgeries done by "biased" Jewish historians designed to discredit Germany.