  We investigate the nature of the point-like optical ``cores'' that have been
found in the centres of the host galaxies of a majority of radio galaxies by
the Hubble Space Telescope. We examine the evidence that these optical cores
are relativistically beamed, and look for differences in the behaviour of the
cores found in radio galaxies of the two Fanaroff-Riley types. We also attempt
to relate this behaviour to the properties of the optical nuclei in their
highly beamed counterparts (the BL Lac objects and radio-loud quasars) as
hypothesized by the simple Unified Scheme. Simple model-fitting of the data
suggests that the emission may be coming from a non-thermal relativistic jet.
It is also suggestive that the contribution from an accretion disk is not
significant for the FRI objects and for the narrow-line radio galaxies of FRII
type, while it may be significant for the Broad-line objects, and consistent
with the idea that the FRII optical cores seem to suffer from extinction due to
an obscuring torus while the FRI optical cores do not. These results are in
agreement with the Unified Scheme for radio-loud AGNs.
