The suspicion which already attached to the prince was increased by the
doubts which were entertained of his religious bias. So long as the
Emperor, his benefactor, lived, William believed in the pope; but it was
feared, with good ground, that the predilection for the reformed
religion, which had been imparted into his young heart, had never
entirely left it. Whatever church he may at certain periods of his life
have preferred each might console itself with the reflection that none
other possessed him more entirely. In later years he went over to
Calvinism with almost as little scruple as in his early childhood he
deserted the Lutheran profession for the Romish. He defended the rights
of the Protestants rather than their opinions against Spanish
oppression; not their faith, but their wrongs, had made him their
brother.

These general grounds for suspicion appeared to be justified by a
discovery of his real intentions which accident had made. William had
remained in France as hostage for the peace of Chateau-Cambray, in
concluding which he had borne a part; and here, through the imprudence
of Henry II., who imagined he spoke with a confidant of the King of
Spain, he became acquainted with a secret plot which the French and
Spanish courts had formed against Protestants of both kingdoms. The
prince hastened to communicate this important discovery to his friends
in Brussels, whom it so nearly concerned, and the letters which he
exchanged on the subject fell, unfortunately, into the hands of the King
of Spain. Philip was less surprised at this decisive disclosure of
William's sentiments than incensed at the disappointment of his scheme;
and the Spanish nobles, who had never forgiven the prince that moment,
when in the last act of his life the greatest of Emperors leaned upon
his shoulders, did not neglect this favorable opportunity of finally
ruining, in the good opinion of their king, the betrayer of a state