Increase Mather, 1639–1723, American Puritan clergyman, b. Dorchester, Mass.; son of Richard Mather. After graduation (1656) from Harvard, he studied at Trinity College, Dublin (M.A., 1658), and preached in England and Guernsey until the Restoration. After returning to Massachusetts (1661), he became (1664) pastor of North Church, Boston, and retained that position through his life. Cotton Mather, his son and colleague, cooperated with him in many of the affairs that occupied their busy lives. They were outstanding upholders of the old Puritan theocracy and of the established order in church and state. This conservatism led to trouble with the government during the Restoration period, and Increase Mather was a particularly bitter opponent of Edward Randolph and Sir Edmund Andros over the withdrawal of the Massachusetts charter and the conduct of the royal government. In 1688 he went to England to present the grievances of Massachusetts, and, after the Glorious Revolution of 1688 and the subsequent revolt in Massachusetts against Andros, he obtained a new charter that united Plymouth Colony with Massachusetts Bay Colony. Increase Mather looked with favor on the government of Sir William Phips. After 1692 his influence declined somewhat, but he remained powerful to the end. He was president of Harvard College (1685–1701), but he was inactive and spent little time in Cambridge. His writing reflected the concerns of his career. Cases of Conscience Concerning Evil Spirits (1693), appearing soon after the Salem witch furor, denounced
in witch trials. He also wrote a biography of his father (1670); A History of the War with the Indians (1676), written just after King Philip's War; and Remarkable Providences (1684), based on an earlier work by other writers.
See biography by K. B. Murdock (1925, repr. 1966); study by R. Middlekauff (1971); bibliography by T. J. Holmes (1931).