A description of her which was penned by a writer in the early part of the seventeenth century represents her as having been reputed in her prime the greatest beauty in Britain. "She was," he says, "of an ordinary stature, not too fat, her mien was majestic, her eyes full, her face was oval, and her complection was delicate and extremely fair. Besides all these perfections, she was a lady of singular chastity; as her body was a finished piece, without the least blemish, so Heaven designed that her mind should want none of those perfections a mortal creature can be capable of; her modesty was admirable, her courage was above what could be expected from her sex, her judgment solid, her carriage was gaining and affable to her inferiors, as she knew well how to behave herself to her equals; she was descended from one of the most honorable and wealthy families of Scotland, and of great interest in the kingdom, but at that time eclipsed." This is the testimony of hearsay, but, allowing for exaggeration, the great impression which she made upon her contemporaries is amply shown. The very nemesis of misfortune seemed to pursue this innocent lady. The next turn of envious fate brought to light a plot for her destruction which was hatched in the dark recesses of a heart burning with passionate resentment over its inability to invade her wifely integrity. William Lyon had been one of the suitors who were disappointed at her acceptance of the son of the Earl of Argyll. After several years had elapsed, this man sought to pass the limits of friendship, and had the baseness to seek to draw her away from the path of honor. Her contemptuous and indignant rebuff rankled in his mind, and led him to lay a deep plot tending to bring Lady Glamis under suspicion of attempting to poison the king. Her former indictment as a poisoner was counted upon to give probability to the charge. She, with all other persons under suspicion as parties to the plot, was arrested and immured in Edinburgh Castle.