The man universally credited with founding the Zionist movement was Theodor Herzl (1860–1904). Herzl’s Zionism was purely political in theory and practice: the Jews as a nation did not need a new culture, language, or concept of the messianic era, but only a national polity of their own, whose creation would solve the problem of anti-Semitism both for the Jews themselves and for Europe as a whole. His book Der Judenstaat (The Jewish State) was a key publication, and he set up the First Zionist Congress in Basel in August 1897. This was a great success, but did not resolve the fundamental ideological divides within the Zionist movement.