"Heinrich Röntgen (1787–1813), was one of four students recommended as explorers to Joseph Banks´ African Association by Johann Friedrich Blumenbach, the others being Friedrich Hornemann, Ulrich ...
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Seetzen, and Johann Ludwig Burckhardt. All died in Africa.
Following the disappearance of British diplomat Benjamin Bathurst near Berlin in 1809, Röntgen accompanied Bathurst´s wife Phillida when she travelled to Germany to search for her husband." - (en.wikipedia.org 31.10.2020)