Excerpt from SITG

Koth and Tigonne share a border, and have been enemies for generations. Though border disputes are a frequent occurrence, in recent years relations between the two kingdoms have been comparatively peaceful. You are banking on the old enmity to motivate your enemy's enemy, just as you're counting on the recent peace to secure your access to the usurper's throne. Walking such a tightrope leaves you with an uncomfortable feeling in your gut, but you have limited options.