The Northern Fortress is a fortress owned by the Nohrian royal family. It is located northeast of the Nohrian capital of Windmire. After Corrin was kidnapped from their Hoshidan family, Garon sent them to be raised there. Since he viewed Corrin as weak, he refused to let them leave the fortress until they could prove that they were worthy to battle for him.
Corrin was not always alone; their Nohrian siblings, Xander, Camilla, Leo and Elise often visited them during their spare time. Xander usually visited the Fortress to train Corrin in combat so that they could leave and stay with the rest of their siblings in Windmire. During Corrin's stay, their four retainers accompanied them; The veteran knight Gunter, the twin sister maids, the capable older sister Flora, and the clumsy younger sister Felicia, and their skilled butler Jakob. Lilith also lived in the Northern Fortress with Corrin after they had unknowingly nursed her back to health.
Early on in the start of Fates, the Nohrian royal siblings visited the fortress. Xander tested Corrin in combat and after being defeated, the crown prince told Garon that they were ready to fight. Garon, pleased with this outcome, allowed Corrin to leave the fortress after staying there for so many years.
- According to the drama cd, the barrier in the fortress seems to strengthen the people who come inside it rather than protect the people that stay within it's walls.