Summary

1911 Encyclopædia Britannica, Volume 7… (1911)

DE LA WARR, or Delaware, an English barony, the holders of which are descended from Roger de la Warr of Isfield, Sussex, who was summoned to parliament as a baron in 1299 and the following years. He died about 1320; his great-grandson Roger, to whom the French king John surrendered at the battle of Poitiers, died in 1370; and the male line of the family became extinct on the death of Thomas, 5th baron, in 1426.
The 5th baron’s half-sister Joan married Thomas West, 1st Lord West (d. 1405) , and in 1415 her second son Reginald (1394–1451) succeeded his brother Thomas as 3rd Lord West.
Source: Wikisource

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