The company Ballets Russes de Monte-Carlo (note the plural) was formed in 1932 after the death of Sergei Diaghilev and the demise of Ballets Russes. Its director was Wassily de Basil (usually referred to as Colonel W. de Basil), and its artistic director was René Blum. They fell out in 1936 and the company split. The part which de Basil retained went through two name changes before becoming the Original Ballet Russe. Blum founded Les Ballets de Monte Carlo, which changed its name to Ballet Russe de Monte-Carlo (note the singular) when Léonide Massine became artistic director in 1938. It operated under this name until it disbanded some 20 years later.