Can I conquer a location I already hold (when it's empty) to trigger conquer effects without scoring points?

Ruling: No, you cannot conquer a location you already hold. A battlefield can only be scored once per turn per player, and since holding and conquering are sub-steps of scoring, you cannot hold or conquer a location if you cannot score it.

Sequence:

• A battlefield can only be scored once per turn per player
• Holding and conquering are sub-steps of scoring
• If you already hold a location, you've already scored it this turn
• Therefore you cannot conquer it again while you hold it

Nuances:

• You also cannot conquer the same battlefield twice in a turn (even if you didn't hold it initially)