Major Frederick Millingen (born 1832) also known as Osman Seifi Bey and Vladimir Andrejevich was an officer in the Turkish army and author of several books including, The Conquest of the World by the Jews. In 1865 he sailed to New York to fight on the Union side of the American Civil War but arrived near the war's end. In 1877 he published his French memoir.
Frederick Millingen was the son of British surgeon Julius Michael Millingen (1800-1878), who was attached to the Greek army. Upon his surrender to the Turks in 1823 he became court physician to five successive sultans. Frederick Millingen's mother Melek Hanim was of Greek, Armenian, and French heritage and wrote the book Thirty Years in a Harem (1872)
Frederick Millingen was baptized in the Greek Orthodox Church and took the name Andrejevitch.
- Wild life among the Koords (1870)
- "Osman Bey and the Birth of the Global Jewish Conspiracy", by Madeleine Elfenbein, Jewish Telegraph Agency
- Modern English Biography: I-Q by Frederic Boase, page 1719