1911 Encyclopædia Britannica, Volume 25… (1911)
“ In 1694 the count was assassinated, and the princess was divorced and imprisoned at Ahlden, remaining in captivity until her death on the 23rd of November 1726. Sophia Dorothea is sometimes referred to as the “princess of Ahlden.” Her two children were the English king, George II., and Sophia Dorothea, wife of Frederick William I. of Prussia, and mother of Frederick the Great. Sophia's infidelity to her husband is not absolutely proved, as it is probable that the letters which purport to have passed between Königsmark and herself are forgeries. ”
