  The Orion Complex is a notable star forming region, that it is fragmented
into several different populations that have substantial difference in their
phase space. I propose a model that attempts to explain the how the Complex has
evolved to this current configuration. In this model, the large scale expansion
can be attributable to a supernova that has exploded 6 Myr ago. The remnant of
which can be seen as Barnard's loop, as the center of the expansion is
consistent with the geometrical center of the HII bubble. This is similar to
the HII bubble and the ballistic expansion that is associated with $\lambda$
Ori, a region which has also been a site of an ancient supernova. Assuming that
the Orion Complex has originally been forming as one long filament spanning
from the bottom of Orion A to $\psi^2$ Ori (or, potentially, as far as
$\lambda$ Ori), Barnard's loop supernova could have split the cloud, which lead
to the formation of Orion C \& D. Furthermore, the shockwave that has
propagated into the filament could have swept along the gas through several pc,
which lead to the formation of the singularly most massive cluster in the Solar
Neighborhood, the ONC. I also discuss other related nearby events, such as the
formation of the Monogem ring, and various runaways that have been ejected from
the Orion Complex.
