We review the evidence supporting valence-fluctuation-mediated superconductivity in CeCu 2Si 2 and CeCu 2Ge 2, where Tc reaches 2.4 K at high pressure. In these systems the valence and magnetic critical points, at pv and pc, respectively, are well separated. Characteristic signatures associated with both are distinct. In contrast, the valence and spin fluctuation regions appear much closer in most Ce-based compounds. Concerning d-transition metals, superconductivity in pure iron emerges in the pressure window 15-30 GPa with the onset of Tc up to almost 3 K. All relevant observations point to unconventional superconductivity, likely mediated by ferromagnetic spin fluctuations