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The Orion Complex is a notable star forming region, that it is fragmentedinto several different populations that have substantial difference in theirphase space. I propose a model that attempts to explain the how the Complex hasevolved to this current configuration. In this model, the large scale expansioncan be attributable to a supernova that has exploded 6 Myr ago. The remnant ofwhich can be seen as Barnard's loop, as the center of the expansion isconsistent with the geometrical center of the HII bubble. This is similar tothe 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 thatthe Orion Complex has originally been forming as one long filament spanningfrom 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 leadto the formation of Orion C \& D. Furthermore, the shockwave that haspropagated 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 SolarNeighborhood, the ONC. I also discuss other related nearby events, such as theformation of the Monogem ring, and various runaways that have been ejected fromthe Orion Complex.

Supernovae in the Orion: the missing link in the star forming history of the region