A younger son of Thomas de Beauchamp, 11th Earl of Warwick and Katherine Mortimer, he was summoned to Parliament on 23 July 1392 as "Willilmo Beauchamp de Bergavenny", by which he is held to have become Baron Bergavenny.
Marriage and heirs 
- Richard de Beauchamp (c.1394-1422), later 2nd Baron Bergavenny and then 1st Earl of Worcester
- Joan de Beauchamp, married the 4th Earl of Ormond
|Ancestors of William de Beauchamp, 1st Baron Bergavenny|
- Carpenter, Christine. "Beauchamp, William (V), first Baron Bergavenny (c.1343–1411)". Oxford Dictionary of National Biography (online ed.). Oxford University Press. doi:10.1093/ref:odnb/50236. (subscription or UK public library membership required)
|Peerage of the United Kingdom|
Richard de Beauchamp
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