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In page George Plantagenet, Duke of Clarence:

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Though most historians now believe Isabel's death was a result of either consumption (tuberculosis) or childbed fever, Clarence was convinced she had been poisoned by one of her ladies-in-waiting, Ankarette Twynyho, whom, as a consequence, he had judicially murdered in April 1477, by summarily arresting her and bullying a jury at Warwick into convicting her of murder by poisoning. She was hanged immediately after trial with John Thursby, a fellow defendant. She was posthumously pardoned in 1478 by King Edward. Clarence's mental state, never stable, deteriorated from that point and led to his involvement in yet another rebellion against his brother Edward.[citation needed]