Political conditions were nonetheless very unfavorable to Philip, who might easily be charged with disturbing the peace of the empire, and at the Second Diet of Speyer, in the spring of 1529, he was publicly ignored by Emperor Charles V. Nevertheless, he took an active part in uniting the Protestant representatives, as well as in preparing the celebrated Protestation at Speyer. Before leaving the city he succeeded in forming, on 22 April 1529, a secret understanding between Saxony, Hesse, Nuremberg, Strasburg, and Ulm.