Johann Wilhelm was a duke of Saxe-Weimar.
Dorothea Susanne of Simmern.
Saxe-Coburg
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Saxe-Coburg was a duchy held by the Ernestine branch of the Wettin dynasty in today's Bavaria, Germany.
Saxe-Coburg, shown with the other Ernestine duchies
Veste Coburg
Coat of arms of Saxe-Coburg at the Veste Coburg with the motto, “Fideliter et constaner” (Latin, “True and steadfast”)
Coat of arms at the State House of Coburg