Sophie Antoinette of Brunswick-Wolfenbüttel (13/23 January 1724 – 17 May 1802)^[1] was the tenth of 17 children of Ferdinand Albert II, Duke of Brunswick-Lüneburg.

Sophie Antoinette married Ernest Frederick, Duke of Saxe-Coburg-Saalfeld on 23 April 1749 at Wolfenbüttel.^[1] She had the following children:

1. Franz Frederick Anton, Duke of Saxe-Coburg-Saalfeld (b. Coburg 15 July 1750- d. Coburg, 9 December 1806), father of Leopold I of Belgium and grandfather of Leopold II of Belgium, Ferdinand II of Portugal, Empress Carlota of Mexico, Victoria of the United Kingdom, and Victoria's husband Prince Albert.
2. Karl Wilhelm Ferdinand (b. Coburg, 21 November 1751- d. Coburg, 16 February 1757).
3. Fredericka Juliane (b. Coburg, 14 September 1752 - d. Coburg, 24 September 1752).
4. Caroline Ulrike Amalie (b. Coburg, 19 October 1753 - d. Coburg, 1 October 1829), a nun at Gandersheim.
5. Ludwig Karl Frederick (b. Coburg, 2 January 1755 - d. Coburg, 4 May 1806); he had an illegitimate son by a Mademoiselle Brutel de la Riviére: Ludwig Frederick Emil of Coburg (b. Hildburghausen, 1779 - d. Coburg, 1827). In turn, the five children of Ludwig Frederick were created Freiherren von Coburg. His descendants still live.
6. Ferdinand August Heinrich (b. Coburg, 12 April 1756 - d. Coburg, 8 July 1758).
7. Frederick (b. Coburg, 4 March 1758 - d. Coburg, 26 June 1758).