Theodore Kosloff (born Fyodor Mikhailovich Kozlov, ; January 22, 1882 – November 22, 1956) was a Russian-born ballet dancer, choreographer, and film and stage actor. He was occasionally credited as Theodor Kosloff. Career Born in Moscow in 1882, Kosloff began his professional ballet career after training at Moscow's Imperial Theater. After graduating in 1901, he began touring internationally with the Diaghilev Ballet Company which he had joined in 1909. He was a preferred partner of Tamara Karsavina. After arriving in the United States in 1909, Kosloff was introduced to influential film director Cecil B. DeMille by the actress and writer Jeanie MacPherson. DeMille was also encouraged to sign Kosloff due to the persistence of his young niece Agnes de Mille, who was an ardent fan of the ballet dancer. DeMille was immediately impressed by the dark-haired young dancer and quickly put Kosloff to work as an actor. Kosloff's first role was in the 1917 DeMille directed The Woman God Forgot opposite the popular American singer and actress, Geraldine Farrar. In Hollywood, Kosloff began a romantic relationship with the American future set-and costume designer and Mrs. Rudolph Valentino, Natacha Rambova. The two danced on the vaudeville stage together. The affair however, was brief and tumultuous. By December 1912, Kosloff was reported to be the choreographic director of La Saison Russe, preparing a short run of American premiers of operas and ballets for Spring 1913 in New York, in coordination with Morris Gest. The pre-season announcement promised Mussorgsky's Khovanshchina and Boris Godunov, Rimsky-Korsakov's Sadko and The Tsar's Bride, Anton Rubinstein's Demon, Alexander Borodin's Prince Igor and Mikhail Glinka's Ruslan and Lyudmila. Kosloff also worked steadily during his acting career as a choreographer and between 1912 and 1916 choreographed several Broadway musicals: The Passing Show of 1915 (1915–1916), A World of Pleasure (1915–1916) and See America First (1916). From 1918 through 1919 Kosloff also appeared on the stage as an actor in the revival of The Awakening. In early 1923, the Los Angeles Times reported that Kosloff had been offered the throne of the Tatars. He traveled to New York City in February of that year, where he saw his brother and fellow dancer Alexis Kosloff and met with representatives of the Liberal party of Kazan. Fearing the resistance of the Conservative party, Kosloff turned down the offer, saying: "I could be Khan, but it is doubtful for how long. And I decided