In August 1087, German princes who opposed Henry IV's rule held a conference in Speyer. The contemporaneous Bernold of St Blasien mentions that Ladislaus sent envoys to the meeting, and "promised that he would assist with 20,000 knights, if it became necessary". Ladislaus also recognized Pope Victor III as the legitimate pope, rather than Clement III, who had been elected pope at Henry IV's initiative. However, Ladislaus provided no further support to Henry IV's opponents after he was informed of Solomon's death in 1087.