The Protestant Reformation was the first successful challenge to the Catholic Church and began in 1521 as Luther was outlawed at the Diet of Worms after his refusal to repent. The ideas of the reformation spread rapidly, as the new technology of the modern printing press ensured cheap mass copies and distribution of the theses and helped by the Emperor Charles V's wars with France and the Turks. Hiding in the Wartburg Castle, Luther translated the Bible into German, thereby greatly contributing to the establishment of the modern German language. This is highlighted by the fact that Luther spoke only a local dialect of minor importance during that time. After the publication of his Bible, his dialect suppressed others and constitutes to a great extent what is now modern German. With the protestation of the Lutheran princes at the Imperial Diet of Speyer in 1529 and the acceptance and adoption of the Lutheran Augsburg Confession by the Lutheran princes beginning in 1530, the separate Lutheran church was established.