Amélie-Julie-Charlotte Castelnau (1819-97), married Richard Wallace in 1871, having been his mistress for many years.
She is said to have been an assistant in a perfumer’s shop when they met. In 1890 Sir Richard Wallace bequeathed to her all his property.
After Wallace’s death, she led a secluded life at Hertford House.
It was almost certainly the loyal desire to fulfil her husband’s wishes that led her to leave the collection at Hertford House to the nation on her death.