It was while at the height of their material success that the provinces of Holland came under the dominion of the house of Burgundy. The peculiar independent constitution of the cities promoted rivalry between them, rather than a common national interest which would have been best for the preservation of their just rights. They were heavily taxed and oppressed and were continually at variance with the ruling power, fighting for the redress of their grievances. By the first half of the sixteenth century the kingdom of the Netherlands had passed to the Emperor Charles V., King of Spain, and Philip, his son, inherited his father's throne. He thereby became monarch of vast territories. Philip determined to utterly subjugate the provinces and carried out a policy of relentless persecution. The people rebelled, brutal punishment followed, and they became victims of the worst excesses of the Inquisition. Deeds of cruelty, tyranny and murder, almost unparalleled in history, were enacted. In those dark days arose that great champion of the people, "William the Silent," Prince of Orange, the "father of his fatherland." Intent on defending the liberties of the nation, he gathered around him a company of gallant spirits, and, principally at his own expense, commenced what at first appeared to be a hopeless struggle. But early victories, hardly won, roused a cowed populace to action. The nation embarked upon the memorable Eighty Years' War, which resulted in the Spanish yoke being overthrown and the founding of the Dutch Republic. William was basely assassinated at Delft in 1584, and Maurice, his second son, succeeded him as Stadtholder. He was ambitious, shrewd, and skilled in the arts of war, and under his rule, and that of his brother Frederick Henry, who succeeded him in 1625, the fortunes of the Dutch gradually rose high. Through times of trial and suffering, hardships endured and conquests won, they emerged valorous and strong, a nation of heroes. Triumphs of arms by land and sea, successes of the merchant fleets and navigators who explored remote parts of the world, the founding of colonies, and ingenuity on the part of the workers in home manufactures, characterised a notable period of great prosperity; the Dutch became supreme in trade, chief rulers of the sea, and accumulated vast wealth. As the seventeenth century advanced commercial welfare continued to increase. Admirals Tromp and De Ruyter swept the seas, gaining brilliant naval victories; in 1667 the safety of London itself was threatened by the appearance of the Dutch fleet in the Thames. But the mastery of the sea eventually passed to England and from that time the fortunes of the Dutch declined. The election of William III.--who had married Princess Mary, daughter of the Duke of York--to the English throne in 1689 marked the close of Holland's greatest days.