Question: Which of Mabel Keyes Babcock's distant relatives wrote "Of Plymouth Plantation" and served as Governor of the Plymouth Colony? 

Context:
Plymouth, Massachusetts
Plymouth /ˈplɪməθ/ (historically known as Plimouth and Plimoth) is a town in Plymouth County, Massachusetts, United States.
 Plymouth holds a place of great prominence in American history, folklore, and culture, and is known as "America's Hometown."
 Plymouth was the site of the colony founded in 1620 by the Pilgrims, passengers of the famous ship the "Mayflower".
 Plymouth is where New England was first established.
 It is the oldest municipality in New England and one of the oldest in the United States.
 The town has served as the location of several prominent events, one of the more notable being the First Thanksgiving feast.
 Plymouth served as the capital of Plymouth Colony from its founding in 1620 until the colony's merger with the Massachusetts Bay colony in 1691.
 Plymouth is named after the English city of the same name, where the "Mayflower" departed for America.
Plymouth Colony
Plymouth Colony (sometimes New Plymouth) was an English colonial venture in North America from 1620 to 1691.
 The first settlement of the Plymouth Colony was at New Plymouth, a location previously surveyed and named by Captain John Smith.
 The settlement served as the capital of the colony and developed as the modern town of Plymouth, Massachusetts.
 At its height, Plymouth Colony occupied most of the southeastern portion of the modern state of Massachusetts.
John Lyford
The Reverend John Lyford (c. 1580 – 1634) was a controversial figure during the early years of the Plymouth Colony.
 After receiving degrees from Oxford University (A.B. 1597, A.M. 1602), he became pastor at Leverlegkish, near Laughgaid, Armagh, Ireland.
 He was the first ordained minister to come to the Plymouth Colony.
 He arrived in 1624 aboard the Charity and pretended to be sympathetic to the Separatist movement there, while in reality he was allied with the Church of England.
 In the months ahead, the leaders of the colony discovered that Lyford had been writing letters to England disparaging the Separatist movement at Plymouth.
 Governor William Bradford seized some of these letters before they were sent, opened them, and confronted Lyford about their contents.
 Lyford apologized, but later wrote another similar letter that was also intercepted.
 After the second incident, Lyford was sentenced to banishment.
Mabel Keyes Babcock
Born in Somerville, Massachusetts, on May 20, 1862, Mabel Keyes Babcock was the daughter of botanist Henry H. Babcock and Mary Porter (Keyes) Babcock.
 She was a descendant of William Bradford, the governor of Plymouth Colony.
 Both of her parents were involved in education: Henry was for a time the principal of Somerville High School in Massachusetts, while Mary, after Henry died, became the headmistress of Kenilworth Hall, a girls' school in the Chicago area.
Of Plymouth Plantation
Written over a period of years by William Bradford, the leader of the Plymouth Colony in Massachusetts, Of Plymouth Plantation is regarded as the most authoritative account of the Pilgrims and the early years of the colony they founded.
John Doane
John Doane (c.1590 - 1685/6) was a politician.
 He arrived in Plymouth Colony on an unknown ship sometime between 1628 and 1632.
 During his long life he is considered a person of note in Plymouth Colony serving in many government capacities associated with the colony government, such as government committees and deputy for Plymouth as well as Assistant Governor in 1632/33.
 He left government service for a time in the 1630s to serve as deacon in the Plymouth Church.
Myles Standish
Myles Standish (c. 1584 – October 3, 1656) was an English military officer hired by the Pilgrims as military adviser for Plymouth Colony.
 He accompanied them on the "Mayflower" journey and played a leading role in the administration and defense of Plymouth Colony from its inception.
 On February 17, 1621, the Plymouth Colony militia elected him as its first commander and continued to re-elect him to that position for the remainder of his life.
Thomas Willett
Thomas Willett (1605 – August 29, 1674) was a British merchant, Plymouth Colony trader and sea-captain, Commissioner of New Netherland, magistrate of Plymouth Colony, Captain of the Plymouth Colony militia and was the 1st and 3rd Mayor of New York City, prior to the consolidation of the five boroughs into the City of New York in 1898.
William Bradford (Plymouth Colony governor)
William Bradford ( 19 March 1590May 9, 1657) was an English Separatist originally from the West Riding of Yorkshire.
 He moved to Leiden in Holland in order to escape persecution from King James I of England, and then emigrated to the Plymouth Colony on the "Mayflower" in 1620.
 He was a signatory to the Mayflower Compact and went on to serve as Governor of the Plymouth Colony intermittently for about 30 years between 1621 and 1657.
 His journal "Of Plymouth Plantation" covered the years from 1620 to 1657 in Plymouth.
Edward Winslow
Edward Winslow (18 October 15958 May 1655) was a Separatist who traveled on the "Mayflower" in 1620.
 He was one of several senior leaders on the ship and also later at Plymouth Colony.
 Both Edward Winslow and his brother, Gilbert Winslow signed the Mayflower Compact.
 In Plymouth he served in a number of governmental positions such as assistant governor, three times was governor and also was the colony's agent in London.
 In early 1621 he had been one of several key leaders on whom Governor Bradford depended after the death of John Carver.
 He was the author of several important pamphlets, including "Good Newes from New England" and co-wrote with William Bradford the historic "Mourt's Relation", which ends with an account of the First Thanksgiving and the abundance of the New World.
 In 1655 he died of fever while on a British naval expedition in the Caribbean against the Spanish.
 He is the only Plymouth colonist with an extant portrait, and this can be seen at Pilgrim Hall, Plymouth, Massachusetts.

Answer: William Bradford