He had proved that by what he had done.

Since she understood all, she no longer doubted that he had killed Don John with the fullest intention, to avenge her, and almost knowing that she was within hearing, as indeed she had been.

He had taken a royal life in atonement for her honour, but he was to give his own, and was to die a shameful death on the scaffold, within a few hours, or, at the latest, within a few days, for her sake.
Then she remembered how on that afternoon she had seen tears in his eyes, and had heard the tremor in his voice when he had said that she was everything to him, that she had been all his life since her mother had died--he had proved that, too; and though he had killed the man she loved, she shrank from herself again as she thought what he must have suffered in her dishonour.

For it was nothing else.

There was neither man nor woman nor girl in Spain who would believe her innocent against such evidence.