Foiled as she was in securing a check on Philip in the Low Countries, the Queen was more successful in robbing him of the aid of the Scots. The action of King James had been guided by his greed of the English Crown, and a secret promise of the succession sufficed to lure him from the cause of Spain. In July 1586 he formed an alliance, defensive and offensive, with Elizabeth, and pledged himself not only to give no aid to revolt in Ireland, but to suppress any Catholic rising in the northern counties. The pledge was the more important that the Catholic resentment seemed passing into fanaticism. Maddened by confiscation and persecution, by the hopelessness of rebellion within or of deliverance from without, the fiercer Catholics listened to schemes of assassination to which the murder of William of Orange lent a terrible significance. The detection of Somerville, a fanatic who had received the Host before setting out for London "to shoot the Queen with his dagg," was followed by measures of natural severity, by the flight and arrest of Catholic gentry and peers, by a vigorous purification of the Inns of Court where a few Catholics lingered, and by the despatch of fresh batches of priests to the block. The trial and death of Parry, a member of the House of Commons who had served in the royal household, on a similar charge fed the general panic. The leading Protestants formed an association whose members pledged themselves to pursue to the death all who sought the Queen's life, and all on whose behalf it was sought. The association soon became national, and the Parliament met together in a transport of horror and loyalty to give it legal sanction. All Jesuits and seminary priests were banished from the realm on pain of death, and a bill for the security of the Queen disqualified any claimant of the succession who instigated subjects to rebellion or hurt to the Queen's person from ever succeeding to the Crown. [Sidenote: Death of Mary Stuart.]