Isaac Allerton, Jr. was a colonel, merchant, and trader in colonial America. He was first in business with his father in New England, and after his fathers death, in Virginia. He was a burgess for Northumberland County and a councilor of Virginia.
He was born in Plymouth, Massachusetts, sometime after May 22, 1627 and before September 21, 1631 however, no birth record has been found for him. He was the son of Mayflower Pilgrim Isaac Allerton and his second wife Fear Brewster, the daughter of Elder William Brewster, the Pilgrim colonist leader and spiritual elder of the Plymouth Colony, and passenger aboard the Mayflower and one of the signers of the Mayflower Compact and Mary Brewster. Fear arrived at Plymouth, Massachusetts on July 10, 1623 aboard the Anne. Fear died sometime before December 12, 1634. His father had been married first to Mary Norris who died on February 25, 1621. He hadhalfsiblings Bartholomew, Remember and Mary, the last surviving passenger of the Mayflower. After Fears death, he moved to the New Haven Colony, and by 1644 had remarried to his third wife, Joanna Swinnerton.
Source: Wikipedia