 It was conducted from 28 January to 25 May 1521, with Emperor Charles V presiding.Prince Frederick III, Elector of Saxony, obtained an agreement that Luther would be promised safe passage to and from the meeting.Johann Eck, speaking on behalf of the Empire as assistant of the Archbishop of Trier, presented Luther with copies of his writings laid out on a table, and asked him if the books were his, and whether he stood by their contents.