"Katherine Stuart (died 1650) was an English noblewoman and Royalist supporter during the English Civil War. She married her first husband George Stewart, 9th Seigneur d'Aubigny, ...
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against the wishes of both King Charles I and her parents. George commanded a regiment for the king in the opening stages of the war and was killed at the Battle of Edgehill. Katherine used a visit to London, ostensibly to deal with her husband's estate, to clandestinely pass messages to Royalists in the city. After her discovery she was imprisoned in the Tower of London before being released by the intervention of the French ambassador. Katherine married James Livingston in 1648 and the pair unsuccessfully attempted to release the king from parliament's captivity during his journey to trial. After the king's execution, the couple fled to the Netherlands where Katherine died in 1650." - (en.wikipedia.org 12.08.2021)
