Vermigli arrived in Strasbourg in October 1553, where he was restored to his position at the Senior School and began lecturing on Judges as well as Aristotle's "Nicomachean Ethics". Vermigli often gathered with other Marian exiles for study and prayer in his home. His lectures on Judges often addressed the political issues relevant for the exiles, such as the right to resist a tyrant. Since Vermigli's departure and the death of Bucer in 1551, Lutheranism had gained influence in Strasbourg under the leadership of Johann Marbach. Vermigli had been asked to sign both the Augsburg Confession and the Wittenberg Concord as a condition of being reinstalled as professor. He was willing to sign the Augsburg Confession, but not the Concordat, which affirmed a bodily presence of Christ in the Eucharist. He was retained and reappointed anyway, but controversy over the Eucharist as well as Vermigli's strong doctrine of double predestination continued with the Lutherans. Another professor in Strasbourg, Girolamo Zanchi, who had converted to Protestantism while under Vermigli in Lucca, shared Vermigli's convictions regarding the Eucharist and predestination. Zanchi and Vermigli became friends and allies. Vermigli's increasing alienation from the Lutheran establishment led him in 1556 to accept an offer from Heinrich Bullinger to teach at the Carolinum school in Zürich. John Jewel, a fellow Marian exile, came along with him.