|"Is this all real? Or has this been happening inside my head?"
The subject of this article is a real-life person, group, company, product, or creative work that has been mentioned "in-universe" in a canon source. The Harry Potter Wiki is written from the perspective that all information presented in canon is true (e.g., Hogwarts really exists), and, as such, details contained in this article may differ from real world facts.
The Great War (Also known as World War I and, contemporaneously, at least, as The War to End All Wars) was a military conflict that lasted from 1914 to 1918 and involved most of the world's great powers.
- Harry Potter and the Philosopher's Stone (video game) (Mentioned only)