Adelaide L. Briggs (b. Schoonmaker) (1830-1888) was born in New York and died in Elmira, New York. In the early 1850s she married John Post, a farmer, and they resided in Seneca, New York. He died in 1874, and in 1883 she became the second wife of William S. Briggs, a lawyer, county judge, and surrogate court officer. They resided in Penn Yan, New York. Briggs wrote to Mary Baker Eddy several times in 1887 expressing interest in taking Eddy's Primary class in Christian Science, but the record does not reflect that she did so.

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