The Baron von Hammerstein are a German family. From the beginning of the 17. Century Hammerstein to Equord, the family divided in 17./18. Century in the lines Hammerstein-Equord, Hammerstein Gesmold and Hammerstein Loxten. Provable ancestor of sex is Hans Adam von Hammerstein.
Documents and calendar entries on the history of Viscount and Baron von Hammerstein, with family trees and seals, edited by Emil Freiherr von Hammerstein-Gesmold, Hanover: Hahn'sche bookstore, 1891