Abergavenny is a market town in South East Wales with a castle established by the Norman lord Hamelin de Balun c. 1087.
[1] The barony by writ was first created in 1392 for Sir William de Beauchamp, a younger son of the 11th Earl of Warwick.
On his death, the Earldom of Worcester became extinct, but the Barony passed to his daughter, who by modern doctrine succeeded as 3rd Baroness.
The title (for it was believed at the time only to be one Barony) was claimed by Edward Nevill, the heir male of the 4th and 2nd Baron, and in 1604 he was summoned to Parliament as Lord Bergavenny.
Co-heirs: The succession to the notional male-line Barony of Bergavenny as it was generally assumed to be at the time was as follows: On the death of the 5th Marquess of Abergavenny in 2000, the pretence that the Barony of Bergavenny descended to heirs male was finally dropped, and so the 6th Marquess of Abergavenny does not claim to hold it.