I would call it Settlers of Catan + Diplomacy. It predates Settlers, obviously, but was actually inspired by Diplomacy and was intended to be a quicker game with a similarly simple, luckless combat system (though it is turn-based, not simultaneous like Diplomacy).
For those not familiar, you can have one warrior in a territory, and he has one strength. Weapons, horses, etc. all have strength bonuses, and these too you can only have one of each in the territory. You attack an adjacent territory and other players next to the defending territory can offer their strength to either side in an alliance system like Cosmic Encounter, except without any reward whatsoever (well, you could promise them resources in the next trade phase, but the game won't force you to make good on that promise, if I recall correctly).
That's (pretty much) it! There is a combat shipment that can be made (looks like it is called Spearheading now, from the product page), but that is the only added complexity there is. No combat die roll, no cards. Sounds maybe too simple, but the negotiation and alliances elevate the game well above the basic mechanical level.
Only played the game once, but really looking forward to getting to play it again with much, much better components.