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A History of the County of Berkshire
… marriage of Edward the Black Prince with his cousin Joan Countess of Kent took place at Windsor on 10 October 1361. … 133 In February 1405 there was yet another plot. Constance Countess of Gloucester obtained access to the imprisoned Earl … hope of placing them in the hands of Owen Glendower. The countess and the princes, however, were pursued and captured. …