The League of Ostermark is a major and late-founding Imperial province that lies at the most north-eastern corners of the Empire of Man. Though having existed during the founding of the Empire, the League itself was formed out of the chaos of the late 19th century, when their former capital of Mordheim was struck by a comet of tremendous size. The resulting destruction of the province's central goverment and the death of the ruling family led the remaining towns and villages of the lands to band together and form a new semi-democratic government which would later become known as the League of Ostermark.

//warhammerfantasy.fandom.com/wiki/Ostermark