However, later biographers have contended that Banneker's mother was the child of Molly Welsh, a former white indentured servant, and an African slave named Banneka.(2) Johnson. "Benjamin Banneker, free black, farmer, mathematician, and astronomer, was born on November 9, 1731, the son of freed slaves Robert and Mary Bannaky, probably near the Patapsco River southeast of Baltimore, Maryland, where his father owned a small farm. For some years, Benjamin seems to have served as an indentured laborer on the Prince George’s County plantation of Mary Welsh, who had dealings with the Bannaky family and in 1773 executed her dead husband’s instructions to release several of her labor force including “Negro Ben, born free age 43.” Walsh was surely not Banneker’s grandmother, as argued by many biographers, but she did leave him a substantial legacy. He then lived alone as a tobacco farmer near the Patapsco River."</ref> The first published description of Molly Welsh was based on interviews with her descendants that took place in 1836, long after the deaths of both Molly and Benjamin. According to that story, Molly purchased Banneka to help establish a farm located near the future site of Ellicott's Mills, Maryland, west of Baltimore.