Mary Baker Dyer was an English

English people

The English are a nation and ethnic group native to England, who speak English. The English identity is of early mediaeval origin, when they were known in Old English as the Anglecynn. England is now a country of the United Kingdom, and the majority of English people in England are British Citizens...

 Puritan

Puritan

The Puritans were a significant grouping of English Protestants in the 16th and 17th centuries. Puritanism in this sense was founded by some Marian exiles from the clergy shortly after the accession of Elizabeth I of England in 1558, as an activist movement within the Church of England...

 turned Quaker

Religious Society of Friends

The Religious Society of Friends, or Friends Church, is a Christian movement which stresses the doctrine of the priesthood of all believers. Members are known as Friends, or popularly as Quakers. It is made of independent organisations, which have split from one another due to doctrinal differences...

 who was hanged

Hanging

Hanging is the lethal suspension of a person by a ligature. The Oxford English Dictionary states that hanging in this sense is "specifically to put to death by suspension by the neck", though it formerly also referred to crucifixion and death by impalement in which the body would remain...

 in Boston

Boston

Boston is the capital of and largest city in Massachusetts, and is one of the oldest cities in the United States. The largest city in New England, Boston is regarded as the unofficial "Capital of New England" for its economic and cultural impact on the entire New England region. The city proper had...

, Massachusetts Bay Colony

Massachusetts Bay Colony

The Massachusetts Bay Colony was an English settlement on the east coast of North America in the 17th century, in New England, situated around the present-day cities of Salem and Boston. The territory administered by the colony included much of present-day central New England, including portions...

 (now in present-day Massachusetts

Massachusetts

The Commonwealth of Massachusetts is a state in the New England region of the northeastern United States of America. It is bordered by Rhode Island and Connecticut to the south, New York to the west, and Vermont and New Hampshire to the north; at its east lies the Atlantic Ocean. As of the 2010...

), for repeatedly defying a Puritan law banning Quakers from the colony. She is one of the four executed Quakers known as the Boston martyrs

Boston martyrs

The Boston martyrs is the name given in Quaker tradition to the three English members of the Society of Friends, Marmaduke Stephenson, William Robinson and Mary Dyer, and to the Friend William Leddra of Barbados, who were condemned to death and executed by public hanging for their religious beliefs...

.
Dyer's origins are unverified, but tradition has it that she was the daughter of Lady Arbella Stuart and Sir William Seymour

William Seymour, 2nd Duke of Somerset

Sir William Seymour, 2nd Duke of Somerset, KG was an English nobleman and Royalist commander in the English Civil War....

. However, because her maiden name was Barrett

Mary Dyer

Mary Baker Dyer was an English Puritan turned Quaker who was hanged in Boston, Massachusetts Bay Colony , for repeatedly defying a Puritan law banning Quakers from the colony...

, this would be a ludicrous assumption and obviously wrong.