The most comprehensive primary source on Van Gogh is the correspondence between him and his younger brother, Theo. Their lifelong friendship, and most of what is known of Vincent's thoughts and theories of art, are recorded in the hundreds of letters they exchanged from 1872 until 1890.[7] Theo van Gogh was an art dealer and provided his brother with financial and emotional support, and access to influential people on the contemporary art scene.[8]

In 1892 Émile Bernard organised a small solo show of Van Gogh's paintings in Paris, and Julien Tanguy exhibited his Van Gogh paintings with several consigned from Johanna van Gogh-Bonger. In April 1894 the Durand-Rue Gallery in Paris agreed to take 10 paintings on consignment from Van Gogh's estate.[269] In 1896, the Fauvist painter Henri Matisse, then an unknown art student, visited John Peter Russell on Belle Île off Brittany.[270][271] Russell had been a close friend of Van Gogh; he introduced Matisse to the Dutchman's work, and gave him a Van Gogh drawing. Influenced by Van Gogh, Matisse abandoned his earth-coloured palette for bright colours.[271][272]