On one side of the dispute originating through the line of James, the new 1st Baron, continued through his son (Sir) William de Berkeley, 1st Marquess of Berkeley in 1463, who was the first male issue from his 3rd marriage to Lady Isabel de Mowbray. This was after two previous marriages that yielded no children. On the opposing side of dispute were the descendants of the aforementioned Elizabeth Berkeley (James' the 1st Baron's, 1st cousin) and in particular through her daughter Margaret (de Beauchamp) that shows some curious tangled sub-plots.