During the agitation that arose in connection with the summoning of the First Vatican Council Chlodwig took up an attitude of strong opposition to the ultramontane position. In common with his brothers, the Duke of Ratibor and Cardinal Prince Gustav Adolf zu Hohenlohe-Schillingsfürst, he believed that the policy of Pope Pius IX of setting the Church in opposition to the modern state would prove ruinous to both, and that the definition of the dogma of papal infallibility would irrevocably commit the Church to the pronouncements of the Syllabus of Errors (1864).