Editing Imperium Asunder (section)

===Imperium Minorum===
"The precedence of the Imperium Minorum is a common view in the Imperium Minorum, but one must know that the foundations of the Jade Empire also date back to the crusade era. Now, Minorum was a pre-extant domain during the Dark Age, so whether or not we can really count it as a founding or if Alexios merely inherited a pre-extant domain can be disputed. On the other hand, the foundations of our own state are wholly distinct and spring forth clearly from the union of worlds conquered and forged into an empire by our own illustrious primarch."
--from The Decline and Fall of the Western Empire by Eouddar Gibzon of the Jade Empire, M38

New Constantine isn't actually Alexios' homeworld, it's the first world his expeditionary fleet came across which refused peaceful compliance. He decided to make an example of them and burned their world to ash, rebuilding it as his own new Imperial world. He could easily have been discovered in Segmentum Solar, or western Ultima segmentum, or anywhere really.

How about this: Alexios's pod lands on Alexandria, a world in central Pacificus. Alexandria was a world of libraries, deep vault ships launched from Terra long ago brought library records as a sort of time capsule, seeking to conserve the knowledge of mankind as best they could, should something terrible happen to Terra. Alexios rose quickly among the clerk-priests of Alexandria, and soon he ruled the planet as Master of Relics. One night Alexios has a dream of a golden angel, coming in the clouds like a great beacon. The next day, his dream proved prophetic as the Emperor of Mankind, Beloved by all, came to Alexandria. Compliance was swift and welcome. Alexios was given command of his XIIth legion and the 99th Expeditionary fleet. Alexios chose to lead his expedition deeply through the warp to expand his father's realm, and found hmself in the far east of Ultima Segmentum. Many worlds knelt to Alexios as he had knelt to the Emperor, but eventually one stood defiant. The name of that world was expunged from all records of the 99th Expedition or the XIIth legion. All of the inhabitants of the world were purged, the seas boiled away, and the mountains bulldozed with massive constructor fleets. The planet was rebuilt with Imperial colonists, and named Constantine. Alexios made it his formal seat, establishing a military bureaucracy in the great basilicas of his golden city. From there, the Angels conquered many more worlds in the name of the Emperor of Mankind, Beloved by All.

Angels of Light