It depicts the German-born British Charlotte of Mecklenburg-Strelitz, the queen consort of Britain.
[1] [2] It was part of pair of portraits commissioned by the royal family featuring Charlotte and her husband George III.
In the background is the south front of Windsor Castle with Queen's Lodge which was later demolished during the Regency era.
The painting was displayed at the Royal Academy Exhibition of 1780, the first to take place at Somerset House.
It remains part of the Royal Collection and hangs in the East Gallery of Buckingham Palace.