William de Reviers, 5th Earl of Devon

William de Reviers, or de Redvers, 5th Earl of Devon (died 10 September 1217), feudal baron of Plympton in Devon, was the son of Baldwin de Redvers, 1st Earl of Devon and Adelise Baluun. William de Redvers is also known as William de Vernon, because he was brought up at Vernon Castle, in Normandy, the seat of his grandfather.

De Redvers took part in Richard the Lionheart's second coronation, in 1194, when the Canopy was supported by four Earls; he consistently supported King John. Nevertheless, at the end of John's life, in 1216 the King permitted Falkes de Breauté, one of his mercenary captains, to seize the Earl's widowed daughter-in-law, force a marriage, and take her dowry. These events are featured in Alfred Duggan's novel, Leopards and Lilies (1954).

On his death his title passed to his grandson, Baldwin de Redvers, 6th Earl of Devon, his only son, Baldwin de Redvers, having predeceased him.

He was married to Mabile de Beaumont, daughter of Robert de Beaumont, Count of Meulan and granddaughter (on her mother's side) of Reginald, Earl of Cornwall and had children:

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