"Franz Botho Graef (12 October 1857, Berlin – 9 April 1917, Königstein im Taunus) was a German classical archaeologist and art historian. His father was painter ...
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Gustav Graef, and his sister, Sabine Lepsius, was also an artist of some note. Graef taught at the University of Jena from 1904 until 1917." - (en.wikipedia.org 04.11.2019)