A very tumultuous, almost anarchical, period in Bohemia followed the death of Albert. The national or Utraquist party, headed by Ptacek, and afterwards by George of Podebrad, was in constant conflict with the Austrian or Romanist nobles, whose leader was Ulrich of Rosenberg. On February 22, 1440, Albert's widow gave birth to a son, known in history as Ladislas Posthumus; but as the question whether the Bohemian crown was hereditary or elective then was still in dispute, this did not contribute as largely to the stability of the common-wealth as might otherwise have been the case. Religious strife also continued. In 1448 a new Papal envoy, Cardinal John of Carvajal, arrived at Prague, and was at first joyfully received by the people. Public opinion, however, soon changed. Carvajal declared that the Pope would never recognise Rokycan as archbishop, and expressed great disapproval when informed that in a convent he visited communion was administered in the two kinds. His conduct generally did not tend to give the Puritan Praguers a favourable opinion of the dignitaries of the Roman Church. When negotiating with George of Podebrad, the head of the national party, who referred to the Compacts, the cardinal denied all knowledge of them. Podebrad therefore sent him the original of that valuable document. Shortly afterwards, Carvajal, frightened by the hostility of the citizens who threatened him with the fate of Hus, precipitately left Prague. It was immediately discovered that the Compacts had disappeared. Rokycan and Magister Pribram appealed to the magistrates, and the cardinal was pursued by armed forces. When arrested he was unable to deny the theft, but he begged to be allowed, to avoid public disgrace, only to open his luggage on his arrival at Benesov. This was granted to him, and he was escorted to that town. Here the Compacts were found hidden away among his luggage, and were brought back to Prague. The mission of the cardinal thus proved an entire failure, and, indeed, only envenomed the religious struggle. Civil war was inevitable; it was only doubtful which party would begin hostilities. It is probable that George of Podebrad and the other national leaders had arrived at the conclusion that the differences between their party and the Austrian one could only be settled by the force of arms, ever since the failure of the negotiations which had taken place at the great meetings of the Estates at Prague in 1446. Podebrad appears to have had evidence proving that the attempts at a reconciliation which the Bohemians had made through frequent embassies to Rome had been frustrated by the secret machinations of Rosenberg, the leader of the Austrian and Romanist party. Still no warlike steps were taken till after the failure of Carvajal's mission to Prague. But immediately afterwards Podebrad assembled an army of about 9000 men near Kutna Hora and marched on Prague.