See biographies by K. Margate (1902, repr. 1970), J. T. Appleby (1958), W. L. Warren (1961, rev. ed. 1978), J. C. Holt (1963), and A. Lloyd (1972); A. L. Poole, From Domesday Book to Magna Carta, 1087–1216 (2d ed. 1955); D. T. Curren-Aquino, ed., King John: New Perspectives (1988). King John is the central character in Shakespeare play of the same name.
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