Mary was the second wife and widow of Jonathan Wells, Jr. (1684-1735) of Deerfield, Massachusetts. She had six children with him, one of whom died at age 16, and two who died in their 20s. The year that Jonathan died, Mary moved into the home of her father-in-law, Justice Jonathan Wells, Sr. (1659-1739). She brought with her an enslaved woman and a "Negro boy" called Caesar. In 1736, "Pompey Negro and Rebecca his wife" were admitted to membership in the church. Pompey was enslaved by Justice Wells and Rebecca might have been Mary's property.
On June 14, 1741, Deerfield's minister "baptized Caesar servant to the widow Mary Wells"; four years later, "Caesar to the widow Mary Wells was admitted to the communion."
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