Antoinette was the second daughter of Francis, Duke of Saxe-Coburg-Saalfeld - sister of Ernest I (Prince Albert's father), Leopold I (King of the Belgians) and the Duchess of Kent (Queen Victoria's mother). In 1798 she married Alexander, Duke of Würtemberg, who had a successful career in the Russian court. She died in St Petersburg.

This is a copy by William Corden after an original portrait by court painter Traugott Leberecht Pochmann of c.1800 (Schloss Ehrenburg, EM 543). The sitter is shown half-length within a painted oval, holding an open book, wearing a black dress with a deep olive green sash and a dark-grey scarf through her blonde hair. It forms one of a set of twelve portraits of the ancestors of Queen Victoria and Prince Albert that were recorded  in a watercolour by Joseph Nash hanging in Queen Victoria’s Bedroom, Windsor Castle, in the mid-nineteenth century (RCIN 919810). The ensemble consisted of portraits of the seven children of Francis, Duke of Saxe-Coburg-Saalfeld and Countess Augusta Reuss of Ebersdorf and their spouses, framed in identical gadrooned frames. It appears the scheme included copies by William Corden and Herbert Luther Smith commissioned by Queen Victoria and earlier portraits adapted for this ensemble.

The Royal Collection also holds a miniature based on the same original by Pochmann (RCIN 420806).