A crofter's daughter, found by chance on the road between Casterly Rock and Lannisport in 286 AC, weeping and bruised after a pair of would-be ravishers; Ser Jaime Lannister chased her attackers off and his younger brother Tyrion, then thirteen, took her into a roadside inn for food and wine. Drink and pity carried into a longer night and a second day; before the week was out the two were wed by a drunken septon, with Tysha believing herself loved by a true lord's son.
The marriage lasted a fortnight before a guardsman of the household carried word to Lord Tywin. Tywin had it annulled and undone in a single afternoon, and he gave Tysha to his garrison at Casterly Rock for a silver each, making Tyrion watch and lie with her at the last. The lord told his son the girl had been a whore Jaime had paid for and the lesson cost a single silver per soldier, and Tyrion believed him for fifteen years. When Jaime confessed the truth in the black cells beneath the Red Keep on the eve of Tyrion's escape, Tyrion went up the secret stairs of the Tower of the Hand to kill his father at last; what became of Tysha after the garrison let her go no song carries, and no chronicle records.