  We present experimental results on single crystal CeRu$_2$ showing that the
extent of history dependence of peak-effect depends on the path followed in the
space of field (H) and temperature (T). The (H,T) regime over which history
effect is observed is larger if the vortex lattice is prepared by lowering T
from above T$_C$ in constant H i.e. by field cooling. We compare this history
effect with the very recently reported history dependence of peak-effect in
detwinned single crystals of YBaCuO, highlighting the similarities and
differences. We discuss the possibility of a first order vortex solid-solid
transition in CeRu$_2$ within the realm of recent theoretical developments in
the field of vortex matter.
