EDIT 30/08/19: Neil79 has confirmed this is now obtainable on the 30/08/19 patch.
EDIT: This is currently unobtainable as purchasing NPC dwellings is glitched. This was also unobtainable on the PC version upon release but was patched. Expect a patch to fix for console.
This is a unity empire quest. Empire quests are activated in the campaign automatically or in a scenario by selecting the 'Empire quest' checkbox under 'advanced setup' and 'gameflow' as you set up the game.
Empire Quests can be viewed in game by bringing up the radial menu with the Y button and selecting "Objectives".
To Unlock The Patron:
- Buy 3 dwellings from an NPC faction
Rewards (For being first player to finish):
- A small army of faction units appear at the capital colony
Complete the Negotiator
- Sign a friendship pact with a faction
- Buy 5 items from a faction
Complete the Emissary
- Do 2 quests for an NPC faction
- Achieve Peace with an NPC faction
EDIT 13/09/19 - To buy a Dwelling from an NPC faction you need the highest influence level "Integrated" with the NPC faction AND have a colony within range of the NPC dwelling with the ability to annex it as a sector.