Энциклопедический словарь Брокгауза и Ефрона
Anrep family was soon naturalized in Sweden and introduced to the "Riddarhuset", or House of Knights, in 1635. According to Brockhaus and Efron Encyclopedic Dictionary, German von Anrep was a Field Marshal in Sweden in the 16th century, and some Anreps were later also on French and Prussian military service .