title: Bolshoi Ballet
context: The earliest origins of the Bolshoi Ballet can be found in the creation of a dance school for a Moscow orphanage in 1773.[1] In 1776, dancers from the school were employed by Prince Pyotr Vasilyevich Ouroussoff and the English theatrical entrepreneur Michael Maddox, to form part of their new theatre company.[2] Originally performing in privately owned venues, they later acquired the Petrovsky Theatre, which, as a result of fires and erratic redevelopment, would later be rebuilt as today's Bolshoi Theatre. While some guest dancers come and go from other very prestigious ballet companies—like the Mariinsky and American Ballet Theatre—many company dancers are graduates of the academy. In 1989,  was the first American ballet dancer to graduate from the Bolshoi Ballet Academy and join the Bolshoi Ballet company.[3]
question: When was the Bolshoi Ballet formed?
answers: 1773