The Boston martyrs is the name given in Quaker tradition[1] to the three English members of the Society of Friends, Marmaduke Stephenson, William Robinson and Mary Dyer, and to the Barbadian Friend William Leddra, who were condemned to death and executed by public hanging for their religious beliefs under the legislature of the Massachusetts Bay Colony in 1659, 1660 and 1661. Several other Friends lay under sentence of death at Boston in the same period, but had their punishments commuted to that of being whipped out of the colony from town to town.
"The hanging of Mary Dyer on the Boston gallows in 1660 marked the beginning of the end of the Puritan theocracy and New England independence from English rule. In 1661 King Charles II explicitly forbade Massachusetts from executing anyone for professing Quakerism. In 1684 England revoked the Massachusetts charter, sent over a royal governor to enforce English laws in 1686, and in 1689 passed a broad Toleration act."[2][3]