  There is a growing literature on dyonic black holes as they appear in string
theory. Here we examine the correspondence limit of a dyonic black hole which
is not supersymmetric. Assuming the existence of a dyon with non-supersymmetric
Kerr-Schild structure, we calculate its gravitational and electromagnetic
fields and compute its mass and angular momentum to obtain a modified B.P.S.
relation. The contributionn of the angular momentum to the mass appears in the
condition for the appearance of a horizon.
