Barbara von Krüdener, German mystic and author (born 1764)

Beate Barbara Juliane Freifrau von Krüdener, often called by her formal French name, Madame de Krüdener, was a Baltic German religious mystic, author, and Pietist Lutheran theologian who exerted influence on wider European Protestantism, including the Swiss Reformed Church and the Moravian Church, and whose ideas influenced Tsar Alexander I of Russia.