Pius XI was the first pope to directly address the Christian ecumenical movement. Like Benedict XV he was interested in achieving reunion with the Eastern Orthodox (failing that, he determined to give special attention to the Eastern Catholic churches). He also allowed the dialogue between Catholics and Anglicans which had been planned during Benedict XV's pontificate to take place at Mechelen. However, these enterprises were firmly aimed at actually reuniting with the Catholic Church other Christians who basically agreed with Catholic doctrine, bringing them back under papal authority. To the broad pan-Protestant ecumenical movement he took a more negative attitude.