1 Ducat - William IX

William IX inherited Hanau-Münzenberg in 1760 at age nine, meaning this 1768 ducat was struck while he was still a minor under regency administration. The county was a small but financially sophisticated Protestant territory wedged between Hesse-Kassel and the Frankfurt trade routes, and its ducat coinage was deliberately struck to Dutch weight and fineness standards to circulate credibly in international commerce — particularly the Rhine trade fairs where Hanau goldsmiths were already dominant.

William would later become Landgrave of Hesse-Kassel in 1785 and accumulated one of the largest private fortunes in Europe, partly by hiring out Hessian troops to the British during the American Revolutionary War.