artillery, while the Spaniard Juan Gris remained from the Cubist circle. During the war, Picasso was able to continue painting uninterrupted, unlike his French comrades. His paintings became more sombre and his life changed with dramatic consequences. Kahnweiler's contract had terminated on his exile from France. At this point Picasso's work would be taken on by the art dealer Léonce Rosenberg. After the loss of Eva Gouel, Picasso had an affair with Gaby Lespinasse. During the spring of 1916, Apollinaire returned from the front wounded. They renewed their friendship, but Picasso began to frequent new social circles. Towards the end of World War I, Picasso became involved with Serge Diaghilev's Ballets Russes. Among his friends during this period were Jean Cocteau, Jean Hugo, Juan Gris, and others. In the summer of 1918, Picasso married Olga Khokhlova, a ballerina with Sergei Diaghilev's troupe, for whom Picasso was designing a ballet, Erik Satie's Parade, in Rome; they spent their honeymoon near Biarritz in the villa of glamorous Chilean art patron Eugenia Errázuriz. After returning from his honeymoon and in need of money, Picasso started his exclusive relationship with the French-Jewish art dealer Paul Rosenberg. As part of his first duties, Rosenberg agreed to rent the couple an apartment in Paris at his own expense, which was located next to his own house. This was the start of a deep brother-like friendship between two very different men, that would last until the outbreak of World War II. Khokhlova introduced Picasso to high society, formal dinner parties, and other dimensions of the life of the rich in 1920s Paris. The two had a son, Paulo Picasso, who would grow up to be a motorcycle racer and chauffeur to his father. Khokhlova's insistence on social propriety clashed with Picasso's bohemian tendencies and the two lived in a state of constant conflict. During the same period that Picasso collaborated with Diaghilev's troupe, he and Igor Stravinsky collaborated on Pulcinella in 1920. Picasso took the opportunity to make several drawings of the composer. In 1927, Picasso met 17-year-old Marie-Thérèse Walter and began a secret affair with her. Picasso's marriage to Khokhlova soon ended in separation rather than divorce, as French law required an even division of property in the case of divorce, and Picasso did not want Khokhlova to have half his wealth. The two remained legally married until Khokhlova's death in 1955. Picasso carried on a