 On December 17, 1717, Reverend Jacob Henderson was appointed rector of Queen Anne Parish, not long after his appointment by the Bishop of London as Commissary (supervisor) for the parishes in the Western Shore of Maryland (a position he held until 1734).In 1712, Henderson married a widow, Mary Duvall Ridgely (née Stanton).An ancestor of hers, Mareen Duvall, had emigrated from France a century earlier, acquired a significant land grant in what became Prince George's County, Maryland, and established a chapel on their property which became Queen Anne Parish and ultimately St. Barnabas Church, Upper Marlboro, Maryland.