A Biographical Dictionary of the Celebrated Women of Every Age and Country/Senena
SENENA, or SINA (Wife of Gryffydh, Son of Llewellyn, Prince of North-Wales).
This prince having been supplanted by his younger brother David, and treacherously confined by him, his wife, a woman of spirit and address, in concert with the Bishop of Bangor, and many of the Welch nobility, entered into a treaty with Henry III. King of England, in hopes of interesting that prince in the cause of her unfortunate husband. She conducted all the business with a tenderness and energy of spirit, which not only marked the tender wife, but the experienced politician; and notwithstanding that David was nephew to the King of England by his mother, she engaged the latter seriously in the interests of Gryffydh, who was at length delivered to the King of England by his brother. David was, however, artful enough, while he submitted to Henry, to infuse mean suspicion in the breast of that prince, who, in consequence of his suggestions, confined him in the Tower of London; where, after suffering two years imprisonment, he was killed by a fall, in attempting his escape, in the presence of his wife and son, who shared his confinement, 1244. This son afterwards became joint sovereign of Wales with his brother.