It was of little advantage to the Poles, that Ladislaus IV., the son and successor of Sigismund, was a man of distinguished merit. At his accession the nobles devised a new condition. Hitherto they had guarded themselves against taxation; they now proceeded to tax the king. For a long period, one quarter of the income of the royal domains had been set apart for the military service, especially for the artillery; they now demanded a concession of a full moiety. But, it may be asked, what was done for the people? The answer would be, absolutely nothing. It did not seem to be imagined, that the labouring class had any rights; not a law was proposed for the benefit of the millions, who cultivated the soil. Even the peasants on the estates of the king were equally oppressed;--why? It was the nobles who farmed the royal domains. Every thing stagnated. Every thing, do we say? The natural instinct of freedom in the Cossacks could brook their abject servitude no longer. They reclaimed their partial independence, complained that their rights were infringed, and found demagogues, who were desirous and were able to lead them. At this crisis the king died, and his brother, John Casimir, a man tried by misfortunes, who, having been the inmate of a French dungeon, afterwards, from disappointment and chagrin, became a Jesuit and a Cardinal, was elected his successor. The powers and the revenues of the king had been plundered; one thing more was alone wanting to give full development to the Polish constitution. In the year 1652, a diet was dissolved by the opposition of a single deputy; this was remarkable enough; but it was still more strange, that what had been once effected by passion, should remain an acknowledged right; and that while the country rung with curses against the deputy who had set the example, the power should still have been claimed as a sacred privilege. No redress could be obtained except by confederations; and it was now the height of anarchy, that public law recognized these separate assemblies. Indeed, the days of the _liberum veto_ were necessarily the days of legalized insurrection. It was a sort of dictatorship, invented for the new contingency. Only the misery was, that there could be as many confederations as there were separate factions. Poland had, all this while, formidable foreign enemies to encounter. The Swedes, the Czar, the Porte, were all greedy for aggrandizement. This was no time for domestic dissensions. The only wonder is, that the nation could have resisted its enemies at all. As it was, several provinces were lost; in 1657, the Duke of Prussia seized the opportunity of freeing himself altogether from his relation as vassal to the Polish crown.