Question: Which Soviet and Russian dancer choreographed the ballet, Spartacus?

Context paragraphs:
Serafina Astafieva: Serafina Astafieva (Russian: Серафима Александровна Астафьева; 1876 – 13 September 1934) was a Russian dancer and ballet teacher.

Babek (ballet): Babek (Azerbaijani: "Babək" )– is a heroic Spartacus like ballet in two acts, based on the story of the people’s liberation struggle against Abbasid Caliphate under the leadership of Babak Khorramdin.  Akshin Alizadeh composed the music and the prominent Azeri choreographers of the Soviet era Rafiga Akhundova and Maksud Mamedov choreographed the ballet for Azerbaijan State Academic Opera and Ballet Theater (National Ballet of Azerbaijan) in 1986.

Vaganova method: The Vaganova method is a ballet technique and training system devised by the Russian dancer and pedagogue Agrippina Vaganova (1879–1951).  It was derived from the teachings of the "Premier Maitre de Ballet", Marius Petipa, throughout the late 19th century.  It was Agrippa Vaganova who perfected and cultivated this form of teaching classical ballet and turned it into a viable syllabus.  The method fuses elements of traditional French style from the romantic era with the athleticism and virtuosity of Italian technique.  The training system is designed to involve the whole body in every movement, with equal attention paid to the upper body, legs and feet.  Vaganova believed that this approach increases consciousness of the body, thus creating a harmony of movement and greater expressive range.

Elizaveta Gerdt: Elizaveta Pavlovna Gerdt (Russian: Елизавета Павловна Гердт ; 29 January [O.S. 17 January] 1891 – 6 November 1975) was a Russian dancer and teacher whose career links the Russian imperial and Soviet schools of classical dance.

Valentin Zeglovsky: Valentin Zeglovsky (1908 – 1985) was a ballet dancer with the Ballets Russes.  Zeglovsky was a Ukrainian Russian dancer who toured Australia with the De Basil Company (1936–1939).  In January 1942 he joined the Kirsova company during its Melbourne season which began at His Majesty's Theatre.  He subsequently started a ballet school in Australia and then London.  He was one of the de Basil dancers who is considered to have contributed to Australian ballet.  His book "Ballet Crusade" is an account of the key events in Zeglovsky's life: his childhood in Kharkov (Kharkiv) in the Ukraine, where he was born in 1908, the Russian Revolution, his apprenticeship in Riga with the State Opera House and Ballet School, his tours with the De Basil Company, and his decision to live and work in Melbourne.  First published in December 1943, it was reprinted in slightly different form by Reed & Harris in September 1944 and again in November 1944.  John Reed's correspondence indicates that Reed & Harris wanted to print 5,000 copies of the book; however, a Reed letter, dated 12 November 1943, states that paper shortages at the Advertiser in Adelaide limited the printing of the first edition to 1,500 copies.  In Zeglovsky's ballet school in London, Zbyshek Lisak trained under him.

Yury Grigorovich: Yury Nikolayevich Grigorovich (Russian: Ю́рий Никола́евич Григоро́вич ; born 2 January 1927 in Leningrad) is a Soviet and Russian dancer and choreographer who dominated the Russian ballet for 30 years.

Yekaterina Geltzer: Yekaterina Vasilyevna Geltzer (November 2, 1876 - December 12, 1962) was a prima ballerina of the Bolshoi Ballet who danced in the theatre from 1898 to 1935.  She is the daughter of the famous Russian dancer Vasily Geltzer.

Spartacus (ballet): Spartacus (Russian: «Спартак», "Spartak" ) is a ballet by Aram Khachaturian (1903–1978).  The work follows the exploits of Spartacus, the leader of the slave uprising against the Romans known as the Third Servile War, although the ballet's storyline takes considerable liberties with the historical record.  Khachaturian composed Spartacus in 1954, and was awarded a Lenin Prize for the composition that same year.  It was first staged, with choreography by Leonid Yakobson, in Leningrad 1956, but only with qualified success since Yakobson abandoned conventional "pointe" in his choreography.  The ballet received its first staging at the Bolshoi Theatre, Moscow in 1958, choreographed by Igor Moiseyev; however it was the 1968 production, choreographed by Yury Grigorovich, which achieved the greatest acclaim for the ballet.  It remains one of Khachaturian's best known works and is prominent within the repertoires of the Bolshoi Theatre and other ballet companies in Russia and the former Soviet Union.

Irek Mukhamedov: Irek Mukhamedov OBE (born March 8, 1960 in Kazan, USSR), is a Soviet-born ballet dancer of Tatar origin who has danced with the Bolshoi Ballet & the Royal Ballet He trained at the Moscow Choreographic Institute under the guidance of Alexander Prokofiev between 1970 and 1978.  Upon graduation he joined the Classical Ballet Company, where he spent three years touring around the world.  It was with this company that he first danced Romeo, a role that was to become one of his most acclaimed.  In 1981 he won the Grand Prix and Gold Medal at the International Ballet Competition in Moscow and was immediately invited to join the Bolshoi Ballet as a principal dancer, where he not only became Grigorovich's favourite danseur but went to become the youngest man ever to dance the leading role in "Spartacus".  After leaving the Soviet Union, he became a Senior Principal Dancer with the Royal Ballet in London, remaining with the company for many years and dancing lead roles in the classic ballets as well as the English repertoire.

John Clifford (choreographer): John Clifford, born June 12th is the founder / artistic director of the original Los Angeles Ballet (1974–1985), and the chamber sized touring ensemble, Ballet of Los Angeles (1988–1991) and the creator of “CASABLANCA, THE DANCE” produced by Warner Bros.  Theatre Ventures, Inc. (which premiered in Beijing, China at the historic "Great Hall of the People" in 2005) and his Los Angeles Dance Theater.  Before that time,Clifford was a principal dancer and choreographer with George Balanchine’s New York City Ballet, (1966–1974) and guest artist from 1974–1980, and was widely considered to be Balanchine’s protégé (Saturday Review).  He choreographed his first (of 8) ballets for the NYC Ballet under Balanchine at age 20 thus making him the 2nd youngest choreographer in history ever to be attached to a major company.  The first was Balanchine himself who was 20 yrs-old when he choreographed his first ballet for Serge Diaghilev's "Ballets Russes."  During his time with Balanchine, in his early 20's, he also was a guest choreographer with co's ranging from the San Francisco Ballet, to the Royal Winnipeg Ballet, to the Deutsche Oper Ballet in Berlin.  Clifford's works were also featured in many TV shows and movies, such as "Flashdance," "The Man Who Loved Women," and TV series such as "Dynasty," "Glitter," and other shows produced by Blake Edwards and Aaron Spelling.

Supporting paragraphs: Spartacus (ballet) Yury Grigorovich
Answer: Yury Grigorovich