Which house does Lucian belong to?

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Is Lucian of aristocratic lineage? If so, which house does he belong to? Is it one of the principal noble houses of Demacia, or is it a minor family?

We might get a Narrative answer—even if that answer turns out to be "Actually, we felt the Demacian Great Houses were constraining characters, so we've retconned them. We know you'll be excited when you see what we have in store for Demacia!" However, this isn't just a "Narrative pls" thread; I'd like to hear proposals and speculation from the lore community. I care more about what you guys think anyway.

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Based on the discussion below, here's one proposal.

Important Elements Here are some elements of his story and theme that should probably come out.

• Lucian was not born into the strictures of the Demacian nobility, but he is educated, and he has definitely not had to toil his whole life in the fields. His outlook is more personal and individual than one would expect from a member of the Demacian ruling class, or from someone who's lived as a serf. (Possibilities for implementation: maybe he's from a minor noble family, or a family of merchants. An alternative that I'm increasingly liking: he might have been born into a priestly class. Or perhaps he was "called" to the priesthood from another background.)
• He's something of an outsider. (Possibilities for implementation: He's not from the capital, but he's from a lesser city; he's not from the sticks, like Quinn & Valor.)
• He knows how to fight the undead. (Possibilities for implementation: the priestly background idea is sounding stronger and stronger.)
• He got some fighting experience somewhere. (Possibilities for implementation: He could be born to a minor noble house that supplies knights and other "non-rabble" soldiers to the King's army. But does he really seem that "military"? Maybe something related, like a family of guardsmen? Another option would be for him to end up joining some knights-errant on a quest.)

Draft Background Here's an attempt to quickly put some of those elements together into a backstory.

• Lucian was born to a family of middling status: not common, but only nominally "landed", with a poor patch of family land in the outskirts of a smaller Demacian city. For generations, the family has made its living as guardsmen for merchants and (occasionally) as hireling soldiers for the great armies of the crown. He went to school and learned his letters. His "vocational training" was more like a police officer's and less like a soldier's.
• His Champion power-spike came in the form of a call to the priestly class. He took his vows and joined a holy order, where he met Senna.
• (Aside: I like the idea that Senna, who was presumably also of Champion power level, won entrance to the League and fought for Demacia on the side, while Lucian shied way from the League's labyrinthine politics and believed Demacia needed his scholarly and priestly work more than it needed another fighter on the Fields. Maybe that's where she got her initial fighting experience. Just have her taken by Thresh before 18 CLE. Then, perhaps Lucian's entry into the League is another way of him trying to live out her legacy.)
• (Or possibly even better—thanks to 2nd Fiddle for the idea—Senna tried to join the League, but wasn't quite strong enough on her own to make the cut. This might have left her feeling ashamed and bitter, possibly driving her to take more and more risks in order to prove herself worthy and unlock her full potential, until eventually she got herself killed. This would add some complexity and inner conflict to Lucian vis-a-vis the League and Demacia: becoming a Champion was her dream, but he also blames that ambition for her unhappiness and her eventual death. He might hold a grudge against the Demacian Champions who declined to vouch for Senna.)
• They were both particularly drawn to texts on the occult and the undead, and the means of driving them out.
• A band of knights errant came to them for aid in their quest to purge the undead. They accompanied them.
• The knights achieved their quest and became knights of the realm, largely retiring from their adventuring ways. Lucian and Senna continued on their own.
• And the rest we know.

Thoughts?