sentences:  Once Murad had sworn an oath to observe the treaty, it was sent to Hungary with Baltaoğlu Süleyman and a Greek, Vranas, for ratification by Vladislaus, Hunyadi, and Branković.Despite the treaty negotiations, planning for the crusade against the Ottomans continued.It is generally assumed that Vladislaus knew the results of the negotiations in Edirne by the beginning of July.