Baron Leybourne is in Baronies of England Alphabetically, Baronies of England Chronologically, Extinct Baronies of England.
Summary
12th March 1310. William Leybourne 1st Baron Leybourne [aged 68] created.
12th March 1310. William Leybourne 1st Baron Leybourne extinct.
Before 12th March 1310 William Leybourne 1st Baron Leybourne [aged 68] was created 1st Baron Leybourne. It isn't clear by what means he was created a Baron. The Barony appears to have become extinct, abeyant, on the death of the 1st Baron.
On 12th March 1310 William Leybourne 1st Baron Leybourne [aged 68] died at Criccieth Castle [Map]. Baron Leybourne extinct or abeyant. His son had predeceased him without issue.