A notable illegitimate line of the family were the Beauforts, descendants of John of Gaunt by his mistress, who held the title of Duke of Somerset and were one of the prominent Lancastrian families in the Wars of the Roses.
A notable illegitimate line of the family were the Beauforts, descendants of John of Gaunt by his mistress, Katherine Swynford. The Beauforts held the title of Duke of Somerset and were one of the prominent Lancastrian families in the Wars of the Roses.