Saxe-Coburg and Gotha (German: "Sachsen-Coburg und Gotha" ), or Saxe-Coburg-Gotha, was an Ernestine duchy ruled by a branch of the House of Wettin, consisting of territories in the present-day states of Bavaria and Thuringia in Germany. It lasted from 1826 to 1918.
The english and german names for this duchy are very similar
This is true, Saxe-Coburg and Gotha  and Sachsen-Coburg und Gotha are very similar.
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