On 20 Mar 1470 the army of William Berkeley 1st Marquess Berkeley (age 44) including Maurice Berkeley 3rd Baron Berkeley (age 35) defeated the army of Thomas Talbot 2nd Viscount Lisle (age 21) at Nibley Green, Berkeley.

Thomas Talbot 2nd Viscount Lisle (age 21) was killed. Viscount Lisle extinct. Baron Lisle abeyant.

Ostensibly a battle of the Wars of the Roses it may also be considered a settling of the dispute over the ownership of Berkeley Castle [Map] which has passed with the Baron Berkeley Feudal to William Berkeley 1st Marquess Berkeley (age 44) rather than with Baron Berkeley which was abeyant, and of which Thomas Talbot 2nd Viscount Lisle (age 21) was a potential heir. Thomas Talbot 2nd Viscount Lisle (age 21) was born to John Talbot 1st Viscount Lisle whose mother was Margaret Beauchamp Countess Shrewsbury and Waterford whose mother was Elizabeth Berkeley Countess Warwick who was a daughter of Thomas Berkeley 10th and 5th Baron Berkeley, Baron Lisle.