  We revisit Minkowski's lost legacy on relativistic electromagnetism in order
to resolve long-standing puzzles over the charge distribution of relativistic
systems like hadrons. Hadrons are unique relativistic electromagnetic systems
characterized by their comparable size and Compton wavelength $r_h \sim
\lambda_C$. As such, it was recently realized that the traditional Sachs
definition of the charge distribution based on a non-relativistic formula is
invalid. We explain that this is the same problem pursued by Lorentz, Einstein
and others, on the electromagnetism of a moving body. We show how various
charge distributions proposed in hadronic physics naturally emerge as the
multipole moment densities in the macroscopic theory of relativistic
electromagnetism.
