The Mariinsky Theatre (Мариинский театр, also spelled Maryinsky Theatre) is a historic theatre of opera and ballet in St Petersburg, Russia. Opened in 1860, it became the preeminent music theatre of late 19th century Russia, where many of the stage masterpieces of Tchaikovsky, Mussorgsky, and Rimsky-Korsakov received their premieres. Since Yuri Temirkanov's retirement in 1988, the conductor Valery Gergiev has served as its general director.