Oswald Achenbach
Oswald Achenbach was a German painter associated with the Dsseldorf school of painting. Though little known today, during his lifetime he was counted among the most important landscape painters of Europe. Through his teaching activities, he influenced the Kunstakademie Dsseldorf. His brother, Andreas Achenbach, who was twelve years older, was also among the most important German landscape painters of the 19th century. The two brothers were humorously called the A and O of Landscapes .
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Source: Wikipedia