When reports of
witchcraft began circulating in
Essex County, Corwin was one of the magistrates called on to make preliminary inquiries into the reports. He and
John Hathorne, another local magistrate, held hearings in early March 1692 in which testimony was gathered from
Tituba,
Sarah Good, and
Sarah Osborne, the first three women accused of being witches. Due to the uncertain constitutionality of the Massachusetts government in 1692 (its charter was vacated in 1684, and it had reformed with the charter following the
1689 Boston revolt that ended Dominion rule of Sir
Edmund Andros), there was a reluctance among colonial leaders to establish courts to hear the cases until Sir
William Phips arrived in May 1692 with the charter that established the
Province of Massachusetts Bay. By this time a significant number of people had been jailed on accusations of witchcraft in the Salem area. Phips, who was appointed governor of the province, as one of his early acts established a special court of
Court of Oyer and Terminer to hear the accumulated cases. Corwin was not initially assigned to the court, but when
Nathaniel Saltonstall resigned in protest over the first hanging, Phips assigned Corwin to the panel. Corwin signed several arrest warrants and transcribed a few of the hearings but scarcity of records from the 1692 events makes it impossible to determine Corwin's overall role in the trials as well as his attitude toward the acceptance in court of
spectral evidence, the idea that actions seen in visions could be an indicator of witchcraft. The special court convicted nineteen of witchcraft and sentenced them to the gallows before it was disbanded in October 1692. The provincial court system was set up in January 1693, with the
Superior Court of Judicature, the province's high court, hearing the remaining witchcraft cases. with direct ties to the
Salem witch trials Corwin's own mother-in-law, Margaret Sheaf Thacher (née Webb; born 1625, Boston, to Henry and Dorabell (née Smith) Webb — died February 23, 1694, Boston), was accused of witchcraft by her servant, Mercy Short. Thacher held extensive holdings in Boston, including her home and acreage which was next to Governor
William Phips' house. Several years after her first husband's death, she married the Reverend Thomas Thacher. From 1669 to his death in 1678, Thacher served as the founding minister of the Old South Church. Thacher, known as a woman of great piety, was never charged, but Short would spend some time behind bars after confessing to witchcraft herself. ==Later life==