Queen Charlotte of England, faithful (and patient!) wife of (the mad) King George III - and rumored to be Britain's first (partially) Black queen, tracing her lineage to an African branch of the Portuguese royal family. Many cite this painting as proof of her African features, while some historians disagree. The devil is certainly in the (facial) details.
Sarah Forbes Bonetta Davies, born into a royal West African Dynasty, became a slave of the King of Dahomey at 5 years old. In June 1850, Commodore Forbes of H.M.S. Bonetta arrived in Dahomey and the King presented him with the girl as a gift for Queen Victoria and was taken to England. A unique and admired figure in history, she spent her life between the British Royal household and her homeland in Africa.