Thwing (Annie) is born in Roxbury.

The daughter of wealthy merchant Supply Clapp Thwing, Annie Thwing lives at 65 Beech Glen Street, and initially becomes a children’s author. But prompted by a desire to find out where her ancestors lived, who were their neighbors, and what the neighborhood was like, she spends nearly 30 years compiling an index of property ownership in 17th and 18th century Boston, which she donates to the Massachusetts Historical Society in 1916,* and a three-dimensional model of 1775 Boston, which she donates to Old South Meeting House in 1909. In a 1935 letter, Oliver Wendell Holmes Jr. tells her, “You have made more out of your life than any woman I have ever known.” Thwing dies in Roxbury on June 5, 1940, and is buried at Forest Hills Cemetery.