A further sub-plot, or extension of the previous one , centres again around John Talbot but this time as a result of his marriage to Margaret de Beauchamp. Their eldest son, John Talbot, 1st Baron of Lisle and 1st Viscount Lisle, was the father of Thomas Talbot, 2nd Baron of Lisle and 2nd Viscount Lisle. This Thomas Talbot sought to exert his claim on the lands of Baron Berkeley on the death of his grandmother Margaret de Beauchamp (daughter of the disenfranchised Elizabeth Berkeley), who in the interim had continued to press her claim to Baron Berkeley lands against James Berkeley the 1st Baron. It brought him into direct opposition with Sir William de Berkeley (2nd Baron and son of James Berkeley and came to a full head at the Battle of Nibley Green (1470), following what is described as Thomas Talbot's impetuous challenge to Sir William, which had concluded by the end of the following day with the death of Thomas Talbot and the subsequent sacking of his Manor at Wotton-under-Edge.