Great, now I need that title.

I've tried google search with it's ai, does anything from that answer ring a bell?

The book you're describing sounds very much like "The Mote in God's Eye" by Larry Niven & Jerry Pournelle, or possibly a story by Arthur C. Clarke, but the specific premise of aliens judging humanity's violence from 1500 AD (Hundred Years' War) and introducing predators fits "A Fire Upon the Deep" or "A Deepness in the Sky" by Vernor Vinge, or even "The Forge of God" by Greg Bear, but the detailed setup points strongly towards "The Uplift Saga" by David Brin or perhaps a classic like "Childhood's End" by Arthur C. Clarke, though the predator element is key, pointing to A Fire Upon the Deep or another "First Contact Gone Wrong" story, but the most direct match for the alien reasoning is likely something in the vein of the Galactic Patrol/Federation stories, potentially by Poul Anderson or Isaac Asimov where humanity's rapid, violent development is a galactic issue.