In the presence of Innocent something like a formal trial occurred. The case was argued by the champions of the two sides, on questions which it belonged to the Church to decide, or which at least the Church claimed the right to decide, the usurpation of an inheritance, and the violation of an oath. Against Matilda's claim were advanced the arguments which had already been used with effect in England, that the oath had been extorted from the barons by force, and that on his death-bed Henry had released them from it; but more than this, Stephen's advocates suddenly sprang on their opponents a new and most disconcerting argument, one which would have had great weight in any Church court, and which attacked both their claims at once. Matilda could not be the rightful heir, and so the oath itself could not be binding, because she was of illegitimate birth, being the daughter of a nun. One account of this debate represents Matilda's side as nonplussed by this argument and unable to answer it. And they might well be, for during the long generation since Henry's marriage, no question of its validity had ever been publicly raised. The sudden advancing of the doubt at this time shows, however, that it had lingered on in the minds of some in the Church. It is not likely that the point would have been in the end dangerous to Matilda's cause, for it would not have been possible to produce evidence sufficient to warrant the Church in reversing the decision which Archbishop Anselm had carefully made at the time. But the pope did not allow the case to come to a decision. He broke off the debate, and announced that he would not decide the question nor permit it to be taken up again. His caution was no doubt due to the difficult position in which Innocent was then placed, with a rival in possession of the capital of Christendom, the issue uncertain, and the support of all parties necessary to his cause. Privately, but not as an official decision, he wrote to Stephen recognizing him as king of England. The letter reveals a reason in Stephen's favour which probably availed more with the pope than all the arguments of the English embassy, the pressure of the king of France. The separation of Anjou at least, if not of Normandy also, from England, was important to the plans of France, and the support of the king was essential to the pope.