OUTLAW
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It happened... on map 2, I knew there was a double-build swamp, but I didn't care at all (I had a spell and a cloak of prohibition, plus an expert berserker, and that's what I relied on)!!!
On a small map, it's possible to generate 2 identical artifacts, and even 3......
So, you can get 2 cauldrons, 2 gladiuses, etc., from different ruins.
With the same probability, they can be found near neutral creatures....
Therefore, you shouldn't be so sure that your opponent doesn't have the same artifact as you.
Good luck ;)