A group of Italian and British landscape painters working in Italy from the 1860s and formally associated in Rome in 1883–4. The moving spirit was Giovanni Costa and its members included George Heming Mason and Frederic, Lord Leighton. Their preferences were for a subdued tonality and broad panoramas evocative of the landscape tradition that stretched back to Claude Lorrain (1604/5–1682). Costa also stressed the importance of sentiment in landscape painting. The work of the group was relatively well known in London, being first exhibited at the Grosvenor Gallery until allegiances were switched to the New Gallery.