  I give a brief review of the search for a proper definition of energy in
General Relativity (GR), a far from trivial quest, which was only completed
after four and a half decades. The equally (or perhaps more) difficult task of
establishing its positivity -- it was to take another fifteen plus years --
will then be summarized. Extension to cosmological GR is included. Mention is
made of some recent offshoots.
