Wilhelm IX, Landgrave of Hesse-Kassel person
also: Crown Prince Wilhelm of Hesse, the Landgrave, Wilhelm, Wilhelm IX
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Mayer Amschel Rothschild worked_for
Wilhelm IX, Landgrave of Hesse-Kassel documented
document
“He became a dealer in rare coins and won the patronage of Crown Prince Wilhelm of Hesse ... gaining the title of 'Court Factor' in 1769.…”
source: url — Mayer Amschel Rothschild · p.1