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The early New Englanders believed that human beings could, by compact with evil spirits, obtain power to suspend the laws of nature and thus injure their fellows. In 1671 Samuel Willard, a minister of Massachusetts, proclaimed that a woman of his congregation, Knapp by name, was bewitched, though her insanity was clearly proven. Between 1684 and 1693 more than 100 persons were tried and convicted of witchcraft and many of them were hanged. Special courts were appointed by Governor Phipps for the trial of witches. Witnesses were frequently guilty of open perjury, for the charge of witchcraft soon came to be used as a means of striking a private enemy. The witchcraft epidemic was especially prevalent at Salem, where a number of persons professed themselves bewitched and singled out those who had bewitched them. Educated men like Increase Mather firmly believed in it. In 1693 the superstition began to weaken chiefly through the writings and protests of Thomas Brattle and Robert Calef, of Boston. The same belief prevailed elsewhere at that time.