In the summer of 1748, by which time she was 50, Lady Jane gave birth to twin boys - Archibald and Sholto - at the house of Madame Le Brun in Faubourg Saint-Germain, Paris.
Central to the case was whether Lady Jane was still able to have children and at the trials, intimate evidence of her menstrual status was presented by servants.
Douglas lawyers countered by providing evidence of a male midwife said to have delivered Lady Jane's babies.
Archibald Douglas was able to inherit and his descendants, who included British Minister Alec Douglas-Home and has family, have benefited ever since.
It was the latter Company that were on duty at the funeral of Robert Burns in 1796 according to officials in the Douglas History Archive [1][permanent dead link] although some references have inaccurately attributed this to the former group.
She married Henry, 2nd Baron Montagu of Boughton and had a daughter, Lucy Elizabeth Scott-Montagu-Douglas (later Countess of Home) to whom the Douglas estates descended.