Borodin’s opera Prince Igor. He began it in 1869, abandoned it to work on his Symphony No. 2, returned to it in 1874, and worked on it by fits and starts from then until his death. The opera was completed and orchestrated in part by Nicolai Rimsky-Korsakov and Alexander Glazunov and was first produced in 1890. Prince Igor tells a complicated story of the campaign of Igor Sviatoslavich, the twelfth-century prince of Novgorod-Seversk, and his military campaign against the Polovtsians, a Tatar tribe. The expedition turns into a disaster, and Igor and his son are taken prisoner.