The Parousian Founding

The Parousian Founding, or referred to as the "Second Founding" of the Imperial Marine Legions, also titled the Legiones Imperialis, occurred in the middling years of the 90th Millennium in the year M90.540 after the end of the Dark Ages of the long Dark and Terran Unification Wars that founded the Stellar Imperium upon Terra at the start of the Sol Reclamation Wars in M90.540.
The second born Four Imperial Marine Legions, along with the prior Primaris and subsequent Trichotomic Foundings were created from the Inheritance-Helix clusters of the 20 superhuman Luminarchs engineered by the Emperor of Mankind from His own genetic code in His gene-laboratories beneath the Imperial Palace on Terra in the Kilaminjanto (Kilamanjaro) Ranges.
In spite of the fact that the gestalt Luminarchs were still in their pre-embryonic stages, the Emperor still waged his Unification Wars of Terra and later the reclamation Wars of Sol—and to these ends He managed to forge complete and viable samples of each Luminarch's DNA—at least prior to their scattering and subsequent far-flung births.
The Emperor used the 9th through 12th iterations of these templates to create the second generation of four Imperial Marine Legions by genetically enhancing initiates hailing from both Terra and Mercury with the Inheritance-Helix derived from the genomes of the second four Luminarchs. The Imperial Marine Legions born of this process were tutored by their Cousins born in the Prior Founding along with the ever-more dwindled Veterans of The I'cartes Regiments, and were utilized to complete the Sol Reclamation Wars and then to initiate the Great Crusade to reunite all of Mankind's scattered colony worlds across the galaxy.
With each Luminarch the Emperor re-discovered during the course of the Great Crusade, He gave command of the Imperial Marine Legion created from their genetic material back to them. Each Luminarch then set up their Legion's headquarters on his/her own homeworld, from which they also recruited new Imperial Marines into the Legion. 
== Parousian Founding Imperial Marine Legions ==
Legion Number	Legion Colors	Luminarch 	Legion Cognomen 	Homeworld
IXth 	 	Anpu Symt Khener 	Dune Wardens 	[Ne'phesa III]
Xth 	 	Mannix Godwyn III 	The Imperial Harbingers	[Chthonia]
XIth 	 	Ruadhán O'Sullivan	The Viridian Order 	[Inisfáil]
XIIth 	 	Serafina Alaric 	The Nightfall Daggers 	[Cilnelea]