He was one of the hostages selected by Henry for the due execution of the treaty, and while in France made that remarkable discovery which was to color his life.

While hunting with the King in the forest of Vincennes, the Prince and Henry found themselves alone together, and separated from the rest of the company.

The French monarch's mind was full of the great scheme which had just secretly been formed by Philip and himself, to extirpate Protestantism by a general extirpation of Protestants.

Philip had been most anxious to conclude the public treaty with France, that he might be the sooner able to negotiate that secret convention by which he and his Most Christian Majesty were solemnly to bind themselves to massacre all the converts to the new religion in France and the Netherlands.

This conspiracy of the two Kings against their subjects was the matter nearest the hearts of both.