  The Regge limit of gauge-theory amplitudes and cross sections is a powerful
theory tool for the study of fundamental interactions. It is a vast field of
research, encompassing perturbative and non-perturbative dynamics, and ranging
from purely theoretical developments to detailed phenomenological applications.
It traces its origins to the proposal of Tullio Regge, almost sixty years ago,
to study scattering phenomena in the complex angular momentum plane. In this
very brief contribution, we look back to the early days of Regge theory, and
follow a few of the many strands of its development, reaching to present day
applications to scattering amplitudes in non-abelian gauge theories.
