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Richard Wilson was an influential Welsh landscape painter, who worked in Britain and Italy. With George Lambert he is recognised as a pioneer in British art of landscape for its own sake and was described in the Welsh Academy Encyclopedia of Wales as the "most distinguished painter Wales has ever produced and the first to appreciate the aesthetic possibilities of his country". In December 1768 Wilson became one of the founder-members of the Royal Academy. A catalogue raisonné of the artist's work compiled by Paul Spencer-Longhurst is published by the Paul Mellon Centre for Studies in British Art.
Theodor Joseph Hagen was a German painter and art teacher.
He was one of the founders of German Impressionism. After trying out several styles during his early years, he became attracted to the plein-air painting of the French Barbizon School.
From 1893, he was a member of the Munich Secession and, from 1902, the Berlin Secession.