Can I get relics back from AI players?

I like to play with a computer ally so I can trade for gold, but he takes all the relics. I know it's possible to wall them, but is there a way to get the relic back after the AI has taken it?

It would be nice anyway to have some commands to control your ally a bit.

I use the addon Forgotten Empires.

Solution 1:

What I usually did in those cases was using siege onagers and the attack in an area command to destroy their monastery (note that I had enforced teams so this aggression went unnoticed). If your civilization doesn't have those, I believe other siege weapons can do it.

Solution 2:

I don't know of any way to get him to give it to you.

You could take a unit like a Trebuchet or Mangonel and use the "Attack Ground" command though. Tell them to attack the ground on a Monastery and you should be able to damage it enough to take the relics yourself if your Monks are quick enough.