I believe it is the Mars temples for the Romans, and I believe it is a Julii building, but I've only played the Scipii thus far so I'm not sure. The Neptune temples (available to the Scipii) give bonuses to naval units, and temples to Vulcan give bonuses to weapons and/or armour I believe. Also, Greek temples to Nike give morale bonuses (I only know that because I just took Sparta where one was located. I was going to level it and put a Roman temple in its stead, but I thought a temple like that might be useful.....)
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