While the leaders of the opposition thus revolved plans of open rebellion, but were still restrained by fears or scruples from taking any decisive step, a design of a very different kind was meditated by some of their accomplices. To fierce spirits, unrestrained by principle, or maddened by fanaticism, it seemed that to waylay and murder the King and his brother was the shortest and surest way of vindicating the Protestant religion and the liberties of England. A place and a time were named; and the details of the butchery were frequently discussed, if not definitely arranged. This scheme was known but to few, and was concealed with especial care from the upright and humane Russell, and from Monmouth, who, though not a man of delicate conscience, would have recoiled with horror from the guilt of parricide. Thus there were two plots, one within the other. The object of the great Whig plot was to raise the nation in arms against the government. The lesser plot, commonly called the Rye House Plot, in which only a few desperate men were concerned, had for its object the assassination of the King and of the heir presumptive.
Both plots were soon discovered. Cowardly traitors hastened to save themselves, by divulging all, and more than all, that had passed in the deliberations of the party. That only a small minority of those who meditated resistance had admitted into their minds the thought of assassination is fully established: but, as the two conspiracies ran into each other, it was not difficult for the government to confound them together. The just indignation excited by the Rye House Plot was extended for a time to the whole Whig body. The King was now at liberty to exact full vengeance for years of restraint and humiliation. Shaftesbury, indeed, had escaped the fate which his manifold perfidy had well deserved. He had seen that the ruin of his party was at hand, had in vain endeavoured to make his peace with the royal brothers, had fled to Holland, and had died there, under the generous protection of a government which he had cruelly wronged. Monmouth threw himself at his father's feet and found mercy, but soon gave new offence, and thought it prudent to go into voluntary exile.
Essex perished by his own hand in the Tower. Russell, who appears to have been guilty of no offence falling within the definition of high treason, and Sidney, of whose guilt no legal evidence could be produced, were beheaded in defiance of law and justice.
Russell died with the fortitude of a Christian, Sidney with the fortitude of a Stoic. Some active politicians of meaner rank were sent to the gallows. Many quitted the country. Numerous prosecutions for misprision of treason, for libel, and for conspiracy were instituted. Convictions were obtained without difficulty from Tory juries, and rigorous punishments were inflicted by courtly judges. With these criminal proceedings were joined civil proceedings scarcely less formidable. Actions were brought against persons who had defamed the Duke of York and damages tantamount to a sentence of perpetual imprisonment were demanded by the plaintiff, and without difficulty obtained. The Court of King's Bench pronounced that the franchises of the City of London were forfeited to the Crown. Flushed with this great victory, the government proceeded to attack the constitutions of other corporations which were governed by Whig officers, and which had been in the habit of returning Whig members to Parliament. Borough after borough was compelled to surrender its privileges; and new charters were granted which gave the ascendency everywhere to the Tories.
These proceedings, however reprehensible, had yet the semblance of legality. They were also accompanied by an act intended to quiet the uneasiness with which many loyal men looked forward to the accession of a Popish sovereign. The Lady Anne, younger daughter of the Duke of York by his first wife, was married to George, a prince of the orthodox House of Denmark. The Tory gentry and clergy might now flatter themselves that the Church of England had been effectually secured without any violation of the order of succession. The King and the heir presumptive were nearly of the same age. Both were approaching the decline of life. The King's health was good. It was therefore probable that James, if he came to the throne, would have but a short reign.
Beyond his reign there was the gratifying prospect of a long series of Protestant sovereigns.
The liberty of unlicensed printing was of little or no use to the vanquished party; for the temper of judges and juries was such that no writer whom the government prosecuted for a libel had any chance of escaping. The dread of punishment therefore did all that a censorship could have done. Meanwhile, the pulpits resounded with harangues against the sin of rebellion. The treatises in which Filmer maintained that hereditary despotism was the form of government ordained by God, and that limited monarchy was a pernicious absurdity, had recently appeared, and had been favourably received by a large section of the Tory party. The university of Oxford, on the very day on which Russell was put to death, adopted by a solemn public act these strange doctrines, and ordered the political works of Buchanan, Milton, and Baxter to be publicly burned in the court of the Schools.