Wilhelmina Powlett, Duchess of Cleveland

Catherine Lucy Wilhelmina Powlett, Duchess of Cleveland (née Stanhope; 1 June 1819 – 18 May 1901), also known as Lady Dalmeny and Lady Harry Vane, was an English historian and genealogist, best known for her 1889 work The Battle Abbey Roll with some Account of the Norman Lineages. She was the mother of Archibald Primrose, 5th Earl of Rosebery, who was Queen Victoria's prime minister for 15 months from March 1894. In 1837 at the time of Victoria's accession, Lady Wilhelmina was reputedly the most beautiful woman at court. She was a Maid of Honour at the Queen's coronation, and served as a bridesmaid at her wedding to Prince Albert.

Lady Wilhelmina Stanhope was the third child and only daughter of Philip Henry Stanhope, 4th Earl Stanhope (1781-1855), FRS, and his wife Catherine Lucy Smith, daughter of Robert Smith, 1st Baron Carrington. Her first name was Catherine, but she was known by one of her middle names in order to distinguish her from her mother.

Her historical works included:

Wilhelmina married twice, firstly in October 1843 to Archibald Primrose, Lord Dalmeny (1809-1851), eldest son of Archibald Primrose, 4th Earl of Rosebery (1783-1868), whom she met three months before at a ball at Buckingham Palace. They had two sons and two daughters before Dalmeny's early death to heart failure. Their eldest son, also named Archibald, inherited the earldom and went on to become prime minister.

She was married secondly in 1854 to Lord Harry Vane (1803–1891), youngest son of William Vane, 1st Duke of Cleveland (1766-1842); he succeeded his brother in the dukedom in 1864, and changed his surname to Powlett. They had no children, and on Cleveland's death all his titles became extinct, with the exception of the barony of Barnard.

...
Wikipedia