Martin Bucer (1491-1551) joined the Reformation after meeting Martin Luther. He tried to mediate between Luther and Zwingli, who disagreed on whether Jesus Christ was present in the bread and wine during the Eucharist. He also believed that Catholics could be persuaded to join the Reformation. All these efforts failed. He was far more successful in the project of organizing the Strasbourg church and in his literary efforts. Here he proved the necessity of caution, pretending to be a Frenchman to avoid attracting unwanted attention to his work. Justifiably so, since he was frequently exiled from his place of residence for his novel ideas.