The Manster District (マンスター地方, Mansutā Chihō lit. Munster Province in the Japanese Version) was founded around the same time the Kingdom of Grannvale around the time of the Gran Calendar Year 649, and since its creation, it has repelled many attempts by the Kingdom of Thracia to be conquered, thanks to the Lance Ritter knight brigade of Leonster, known as the "Wall of Leonster", although all of the castles of the Manster District have their own separate military force.