He was succeeded by his brother, the King of Poland, under the title of Henry III. The persecutions of the Huguenots were renewed, and the old scenes of treachery, assassination, and war were acted over again. The cause of religion was lost sight of in the labyrinth of contentions, jealousies, and plots. Intrigues and factions were endless. Nearly all the leaders, on both sides, perished by the sword or the dagger. The Prince of Conde, the Duke of Guise, and his brother, the Cardinal of Lorraine, were assassinated. Shortly after, died the chief mover of all the troubles, Catharine de Medicis, a woman of talents and persuasive eloquence, but of most unprincipled ambition, perfidious, cruel, and dissolute. She encouraged the licentiousness of the court, and even the worst vices of her sons, that she might make them subservient to her designs. All her passions were subordinate to her calculations of policy, and every womanly virtue was suppressed by the desire of wielding a government which she usurped. Henry III. soon followed her to the grave, being, in turn, assassinated by a religious fanatic. His death (1589) secured the throne to the king of Navarre, who took the title of Henry IV. Henry IV., the first of the Bourbon line, was descended from Robert, the sixth son of St. Louis, who had married the daughter and heiress of John of Burgundy and Agnes of Bourbon. He was thirty-six years of age when he became king, and had passed through great experiences and many sorrows. Thus far he had contended for Protestant opinions, and was the acknowledged leader of the Protestant party in France. But a life of contention and bloodshed, and the new career opened to him as king of France, cooled his religious ardor, and he did not hesitate to accept the condition which the French nobles imposed, before they would take the oaths of allegiance. This was, that he should abjure Protestantism. "My kingdom," said he, "is well worth a mass." It will be ever laid to his reproach, by the Protestants, that he renounced his religion for worldly elevation. Nor is it easy to exculpate him on the highest principles of moral integrity. But there were many palliations for his conduct, which it is not now easy to appreciate. It is well known that the illustrious Sully, his prime minister, and, through life, a zealous Protestant, approved of his course. It was certainly clear that, without becoming a Catholic, he never could peaceably enjoy his crown, and France would be rent, for another generation, by those civil wars which none lamented more than Henry himself. Besides, four fifths of the population were Catholics, and the Protestants could not reasonably expect to gain the ascendency. All they could expect was religious toleration, and this Henry was willing to grant. It should also be considered that the king, though he professed the reform doctrines, was never what may be called a religious man, being devoted to pleasure, and to schemes of ambition.