Bishop Gardiner, who had been kept in prison while Parliament was in session lest his presence in the Upper House might lead to trouble, was released in January 1548, but in May a peremptory summons was issued commanding him to come to London without delay. He obeyed, and for some time negotiations were carried on, until at last he was ordered to preach against the Pope, monasteries, confession, and in favour of the English Communion service (29th June). He was urged not to treat of the sacrifice of the Mass, or of Transubstantiation, and warned of the serious consequences that might ensue in case he disobeyed; but Gardiner was a man who could not be deterred by such means from speaking his mind, and as a consequence he was again placed under arrest, and sent as a prisoner to the Tower. Cranmer, who had rejected the authority of the Pope because he was a foreigner, finding that he could get no support from the clergy or the universities--for in spite of everything that had taken place the theology of Oxford and Cambridge was still frankly conservative--invited preachers to come from abroad to assist in weaning the English nation from the Catholic faith. The men who responded to his call formed a motley crowd. They were Germans like Martin Bucer and Paul Fagius, Italian apostate friars like Peter Martyr (Pietro Martire Vermigli) and Ochino, Frenchmen like Jean Véron, Poles like John à Lasco, Belgians like Charles Utenhove, à Lasco's disciple, and Jews like Emmanuel Tremellius.[52] The order for the total removal of images and for the Communion service in English led to serious disturbances even in the London churches, where the new opinions should have found the strongest support, and confusion reigned throughout the country.