Heirhein is a dukedom of Agustria, ruled by Lord Boldor and his son, Elliot. When Eldigan leaves Nordion in an attempt to convince King Chagall to stop the military build up in Agustria and is imprisoned, Chagall orders Boldor to seize Nordion. Due to his friendship with Eldigan, Sigurd, stationed at Evans Castle in Verdane at the time, and his army move to rescue Nordion and Princess Lachesis and end up capturing Heirhein.