That is RTW's engine fault, there's very little that can be done about it...
Not building roads in your border regions (those you don't wish to expand further) will deter the AI longer...
As the Aruernoi, also build stone walls there asap, I carried on with the planned eastward conquest, while thousands of Swebozez met their end by the hand of few Milnaht and Batacorioi ^^
While the Lusotannan were my allies (with regular tribute) iirc, and forever engaged with the Karthadastim...
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