"He collected objects of art from throughout the Middle East, especially from Persia and Constantinople. These items were put on exhibition in Berlin (1899), and later Paris at the Exposition des arts musulmans (1903). He donated most of his collection to the Kaiser Friedrich Museum in Berlin, where from 1921 to 1931 he was the director of its "Islamic department"." - (en.wikipedia.org 30.10.2019)
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