Question: Elizabeth Violet Polunin is most notably know for her work with a Russian ballet impresario born in which year ?
Sentence (from "Elizabeth Polunin"): Elizabeth Violet Polunin, (née Hart), (21 May 1887- 1950) was a British artist and theatre designer, most notably for her work with Sergei Diaghilev and the Ballets Russes.
Relevant evidence: Yes