It was entirely the fault of the Polish nobles that Poland lost Lithuania or White Russia. The only excuse that can be offered, is the spirit of religious persecution which was rampant all over Europe (p. 141) in the seventeenth century. It was the ceaseless effort of the Poles to force the Lithuanians from the Greek into the Roman Church that drove them into the arms of Russia; but it was not until after the death of Michael, in 1645, that the consequences of this short-sighted policy were to show. Michael was succeeded by his son, who ascended the throne as Alexis Michaelovitch. He was better educated than his father had been and resembled him in good nature. He had been taught by a tutor named Morozof, who during thirty years exerted a great influence over his pupil. When Alexis married into the Miloslavski family, its members secured the most influential positions, according to well-established custom. Morozof did not oppose them; instead he courted and married the czarina's sister, and thus became the czar's brother-in-law. The wars in which Russia was engaged and the necessity of maintaining a large and well-equipped army, together with the increasing expenses of the Court, and above all, the dishonest practices of the officials rendered the burden of taxation so unbearable, that several revolts broke out. In 1648, the people of Moscow rose and demanded the surrender of a judge and another officer, both of whom were notoriously corrupt; the two men were promptly murdered. Then the popular fury turned upon Morozof, who would have suffered the same fate, had not the czar helped him to escape. The government was helpless. In some places, such as Pskof, Novgorod, and elsewhere, the streltsi joined the people, and Russia was for some time at the mercy of an enemy. It was fortunate for Russia that just at that time, Poland had (p. 142) serious trouble at home. A Cossack, owner of a large estate, educated and brave, was ill-treated and imprisoned by a Polish landowner; and his little son was publicly whipped. He went to Warsaw and laid his complaint before the king. Vladislas told him plainly that the nobles were beyond his control; then, pointing to his sword, he asked if the Cossack could not help himself. The Cossack took the hint, went home, and when the Polish landowners tried to arrest him, he fled to the Khan of the Crimea, interested him in his cause and returned at the head of a Mussulman army. Lithuania rose in rebellion against Poland; the governors and nobles, and especially the priests of the Catholic Church, were hunted down, and those of the Greek Church took revenge for recent injuries and insults.