Mesca Amuntic

 was the mother of one of the sons which was involved in a succession crisis. One of the other mother's, Wembik, poisoned her on the orders of the human tracer Zara. Before the crisis she was set to be married to Thetris, but after negotiations by the Fifth Doctor's companion Amy, she was to marry Wembik with Mesca's son becoming the King so they could both be mother to the king. (AUDIO: The Judgement of Isskar)