|"Is this all real? Or has this been happening inside my head?"
The subject of this article is a real-life person, 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.
|Jhr. Mr. J. C. M. van Riemsdijk|
Jhr. Mr. Johan Cornelis Marius van Riemsdijk was a Dutch musician and author. A copy of his book Het Stads-muziekcollegie te Utrecht (Collegium musicum ultrajectinum): Eene Bydrage tot de Geschiedenis der Toonkunst in Nederland could be found in the Hogwarts Library by the 1990s.
- Harry Potter films (Mentioned on book cover)