Farnese also became a Papal Legate, arranging peace between the perpetually warring Charles V, Holy Roman Emperor and Francis I of France. In the Consistory of 24 November 1539 he was sent as Apostolic "Legatus a latere" to attempt to arrange a peace between the two feuding monarchs. He left Rome on 29 November and made his solemn entry into Paris on 31 December. He was in Rouen on 14 January 1540, and had a solemn meeting with the King on 14 February. He then left for Flanders on 17 February for a meeting with the Emperor; he stayed for three months, and returned to Paris on 14 May. He had a meeting with King Francis on the 17th at Saint-Germain-en-Laye. He returned to Rome on 5 June 1540.