the Imperial Russian Ballet. To stage these ballets with her newly formed company, de Valois employed Nicholas Sergeyev, a former régisseur of the Imperial. He staged productions of Petipa's The Sleeping Beauty; Petipa and Ivanov's Swan Lake and The Nutcracker; Petipa and Cecchetti's production of Coppélia; and Petipa's Giselle. Created with the aid of choreographic notation written in St Petersburg at the turn of the 20th century, these works have been included in the repertoire of the Royal Ballet ever since. The company now uses Peter Wright's 1984 production of The Nutcracker, which uses some of Sergeyev's notation. Sergeyev's revivals of these ballets in London are regarded as the foundation point of the traditional classical ballet repertoire, and led to their being restaged throughout the world. Sergeyev is considered to have made one of the most significant contributions to the popularity of ballet worldwide. His choreographic notation and other materials relating to it have been preserved in the Sergeyev Collection, part of the theatre collection of the Harvard University Library. Prima ballerina assoluta The Royal Ballet is one of the few ballet companies in the world to have employed four dancers considered to be prima ballerina assoluta, including three who studied at the Royal Ballet School. The first was Alicia Markova who, having been mentored by Ninette de Valois as a member of Serge Diaghilev's Ballets Russes, was invited to become one of the founder dancers of the Royal Ballet. She was designated the company's first Prima ballerina, and was later recognised as a Prima ballerina assoluta. Margot Fonteyn trained at the Royal Ballet School and spent her entire career with the company. As a gift for her 60th birthday, she was appointed Prima ballerina assoluta by Queen Elizabeth II. Phyllis Spira joined the Royal Ballet School in 1959, graduating into the Royal Ballet touring company. She later returned to her native South Africa, where she was appointed Prima ballerina assoluta by the President in 1984. The most recent is Alessandra Ferri, who completed her training at the Royal Ballet Upper School and began her career with the Royal Ballet. After dancing with the company for 4 years, she was later appointed prima ballerina assoluta of La Scala Theatre Ballet in Milan. Other prima ballerina assoluta have also appeared with the Royal Ballet as guest dancers, including: the French ballerina Yvette Chauvire and the Georgian ballerina Nina Ananiashvili. Structure The