A Cyclopaedia of Female Biography/Senena, or Sina
SENENA, or SINA,
Wife of Gryffydh, son of Llewellyn, Prince of North Wales. Gryffydh having been supplanted and imprisoned by his younger brother, David, Senena, a woman of spirit and address, in concert with the Bishop of Bangor, and many of the Welsh nobility, entered into a treaty with Henry the Third, hoping to interest him in her husband's cause. She managed the business so well that she induced Henry to demand Gryffydh of his brother, who gave him up, but, at the same time, infused such suspicions of Gryffydh into the breast of Henry, that he confined him in the Tower of London. After two years' imprisonment, Gryffydh was killed by a fall, while attempting to escape, in the presence of his wife and son, who shared his captivity, 1244. This son afterwards became joint sovereign of Wales, with his brother.