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William Dighton was a medieval English clerk in the Privy seal and briefly Keeper of the Privy seal. He was the illegitimate son of a priest. He served as a clerk in the Privy Seal office from 1356 to 1394 under Edward III and Richard II. For a short time, (1381–1382), he was promoted to Keeper of the Privy Seal. He was displaced from the position by a superior candidate in Walter Skirclaw, later Bishop of Coventry and Lichfield, after which Dighton resumed his previous role as a clerk.