Rye House Plot
2 of the 7 encyclopedias on this shelf carry an entry for Rye House Plot. Both are reproduced below, so you can see where they agree and where they differ.
Collier's New Encyclopedia (1921)
in English history, a conspiracy immediate object of which was to assas- , planned in 1683, the sinate Charles II. Duke of York (afterward James II.), as and his brother, the they returned from the Newmarket races. This plan was to have been executed on the road to London, near a farm called Rye House, belonging to one of the conspirators named Rumbold; but it was frustrated by the king and his brother happening to return from Newmarket earlier than was expected. The detection of the plot led to the arrest, on a charge of high treason, of Lords William Russell, Essex, and Algernon Sidney, who were in no way connected with it. Essex put an end to his own life in the Tower, while Russell and Sidney were beheaded, as also Lieutenant-Colonel Walcot, one of the real contrivers of the plot.
Aiton's Encyclopedia (1910)
in English history, an attempt to assassinate Charles II and his brother the Duke of York. The ill-contrived plan was arranged by a lot of low fellows. It was to be put into effect at a farm known as the Rye-House, belonging to one of their number, as the king and his brother were returning from the Newmarket races. The plot was frustrated by the return of the royal party earlier than was anticipated. Some inkling of the conspiracy leaked out and numerous executions followed. Three noblemen, Lord William Russell, Lord Essex, and Algernon Sidney, who were in all probability totally ignorant of the plot, became involved in the general charges which followed and were executed. See Gunpowder Plot