From this time forward the Protestant party concentrated their efforts on securing the exclusion of the Duke of York from the English throne. Charles II. had married Catharine of Braganza, by whom there was no issue, and consequently his brother was the lawful heir. At the same time it was clear to everybody, that James was so firmly attached to the Catholic Church that neither the fear of losing the crown nor the zealous efforts of Stillingfleet and other distinguished ecclesiastics were likely to bring about his re-conversion to Protestantism. The news, too, of his projected marriage with Mary the daughter of the Duke of Modena, opening as it did the prospect of a long line of Catholic rulers in England, was not calculated to allay the fears of the Protestants. After he had been dismissed from office the Earl of Shaftesbury set himself deliberately to fan the flames of religious bigotry, in the hope of securing the exclusion of the Duke of York from the throne. With this object in view it was proposed either that Charles should procure a divorce from Catharine of Braganza, so as to be free to marry some younger lady by whom an heir might be born, or else that with the consent of Parliament he should vest the succession in his illegitimate son, the Duke of Monmouth. Just then, when feeling was running high in England, a wretch named Titus Oates came forward with a story of a Popish Plot. Oates, formerly a preacher and minister of the Established Church, had feigned conversion to Catholicism, and had gained admission to the English colleges at Valladolid and St. Omer from which he was dismissed. Acting in conjunction with Israel Tonge he concocted the details of a plot, according to which the Pope and the Jesuits were to bring about the murder of the king and the overthrow of the Protestant religion. His story was so full of contradictions and absurdities that it is difficult to understand how it could have obtained credence among sane men, but in the state of opinion at the time, it was seized upon by Shaftesbury and others as the best means of stirring up a great anti-Catholic agitation that would bar the way to the accession of the Duke of York. The mysterious death of Sir Edmund Godfrey, a London magistrate to whom Oates had entrusted a copy of his depositions, and the discovery of some French correspondence amongst the documents of Father Coleman, the private secretary of the Duchess of York, helped to strengthen public belief in the existence of the plot. When Parliament met in 1678 both houses professed their belief in the existence of a "damnable and hellish plot," voted a salary to Oates, ordered all Catholics to leave London and Westminster, procured the arrest of a number of Catholic peers, and decreed the exclusion of Catholics from the House of Commons and the House of Lords by exacting a declaration against the Mass, Transubstantiation and the invocation of the Blessed Virgin (1678). It