Upon the death of his grandmother, Margaret Beauchamp, in 1467, Lisle inherited her claims upon the lands of Baron Berkeley.
He attempted to gain entrance to Berkeley Castle by bribery; but the plot was discovered, and in a fit of pique, he challenged Lord Berkeley to a trial of arms.
The superior numbers of Berkeley won the day: Lisle's troops were routed, he was slain on the field by a James Hiatte,[3] and Berkeley pillaged Lisle's manor of Wotton-under-Edge.
Lady Lisle miscarried a son shortly thereafter; the Viscounty of Lisle became extinct, and the barony passed into abeyance between his two sisters.
This biography of a viscount or viscountess in the Peerage of England is a stub.