▁is ▁now ▁known ▁as ▁the ▁Serge ye v ▁Collection , ▁fear ing ▁that ▁these ▁in valu able ▁records ▁would ▁be ▁lost ▁to ▁poster ity ▁in ▁the ▁up he aval ▁of ▁the ▁B ols he vik ▁Revolution ▁and ▁the ▁Civil ▁War ▁that ▁followed . ▁ ▁He ▁used ▁these ▁records ▁in ▁his ▁subsequent ▁employ ment ▁by ▁many ▁of ▁the ▁leading ▁Western ▁bal let ▁companies ▁of ▁the ▁time , ▁ ▁and ▁after ▁his ▁death ▁they ▁finished ▁up ▁hous ed ▁at ▁the ▁Harvard ▁University ▁Library ▁Theatre ▁Collection . ▁ ▁In ▁ 1 9 2 1 ▁he ▁met ▁Serge ▁Di agh ile v ▁in ▁Paris . ▁ ▁He ▁had ▁of ▁course ▁known ▁Di agh ile v ▁in ▁St ▁Petersburg ▁when ▁they ▁both ▁worked ▁for ▁the ▁Imperial ▁Bal let . ▁ ▁Di agh ile v ▁h ired ▁him ▁for ▁his ▁Bal lets ▁Russ es ▁company ▁and ▁brought ▁him ▁to ▁London ▁to ▁reproduce ▁in ▁its ▁original ▁form ▁the ▁bal let ▁S leep ing ▁Princess ▁( now ▁known ▁as ▁S leep ing ▁Beaut y ) ▁for ▁his ▁finan cially ▁dis astr ous ▁ 1 9 2 1 ▁season ▁at ▁the ▁Al h amb ra ▁Theatre . ▁ ▁After ▁disag re ements ▁with ▁Di agh ile v ▁he ▁went ▁to ▁R iga ▁as ▁reg isseur ▁of ▁the ▁Lat v ian ▁National ▁Opera ▁Bal let . ▁ ▁He ▁also ▁founded ▁his ▁own ▁company ▁and ▁produced ▁Act ▁IV ▁of ▁La ▁Bay ad ere , ▁La ▁F ille ▁mal ▁Gar de e , ▁and ▁Pa qu ita , ▁all ▁from ▁his ▁Mary in sky ▁not