Who dated Sergei Diaghilev?

Sergei Pavlovich Diaghilev ( dee-AG-il-ef; Russian: Серге́й Па́влович Дя́гилев, IPA: [sʲɪrˈɡʲej ˈpavləvʲɪdʑ ˈdʲæɡʲɪlʲɪf]; 31 March [O.S. 19 March] 1872 – 19 August 1929), also known as Serge Diaghilev, was a Russian art critic, patron, ballet impresario and founder of the Ballets Russes, from which many famous dancers and choreographers would arise.

Diaghilev's career can be divided into two periods: in Saint Petersburg (1898–1906) and while as an emigrant (1906–1929).