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The Limbourg Brothers (The brothers van Limburg / Brüder von Limburg) were Herman of Limburg, Paul of Limburg, Johan of Limburg. The main work is the 'Book of Hours Très Riches Heures des Duc de Berry' (1412-1416). The brothers were the sons of Arnold of Limburg.
Medieval, Miniature painting
http://www.louvre.fr/en/expositions/belles-heures-jean-de-france-duc-de-berry