Fire Emblem: The Age of Legend
Year of the Second Age when more than a hundred princes of various parts of the Northwestern Nations agreed upon a common currency to use in the future: the Silver North-Ring. This eventually spread until in the modern day it is nearly universal among those nations and even sometimes used in Peruvia.
One of the catalysts of this historic agreement was that earlier in the year the Frysolythian Empire under Emperor Augyth the Conquerer had marched through the previously conquered northern half of Savaritania and emcamped his army in the Peruvian Hills. There they menaced not only Peruvia but all the weaker, divided areas beyond.
As it turned out, the Glorious Winter campaign was to put a temporary end to this menace in the next year, but the agreement stuck.