For centuries the exchange of letters between Ivan the Terrible (1530-1584) and Prince Kurbskii, Muscovy's first notable defector, has been considered an authentic and important source for sixteenth-century Russian history. The Ivan portrayed in these letters has dominated posterity's perception of him and his time. But the provenance of the "Correspondence" has never been properly established.

Edward L. Keenan draws on all the tools of source study and literary criticism to demonstrate that the "Correspondence" is a forgery, and in fact was composed some decades later in...