|"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.
Vlad the Impaler was the son of Count Vlad Drakul. He was the Prince of Wallachia, which later became Romania. Despite being the son of a known vampire, it is unclear whether or not Vlad the Impaler is one as well.
Behind the scenes
- Little is known of vampires in J. K. Rowling's work, and whether it is possible for a person to be born a vampire or if they have to be "turned". Also, since partial vampires exist, this raises question to whether Vlad the Impaler is a half-vampire, vampire, or human, but nothing has been confirmed as of yet.
- Vladislav III, also known as Vlad the Impaler, was an actual historical figure. He was Prince of Wallahia who reigned three times between 1448 and 1476. His epithet, "Impaler", originated from his favoured method of executing those who opposed him. Vlad III is indeed widely speculated to have been the inspiration behind the title character of Bram Stoker's 1897 novel Dracula.
- The real life Vlad the Impaler (or Wladislaus Dragwlya, as he signed his name), was born in 1431 and died in either 1476 or 1477. Bram Stoker's fictionalised Dracula seems to be based more on the German 15th century manuscripts which focused on Vlad "the Impaler" Dracula's cruelty rather than the Russian accounts from the same period, which portrayed him more positively as a strong leader. 
- Vlad the Impaler earned the name Drakula or Dragwlya from his father and the name meant "little dragon", "son of a dragon" or "son of Drakul"  . His father was given the name Drakul because he belonged to the Order of the Dragon. The name Drakul came from the Romanian "drac" which originally mean "dragon" but later came to mean "devil." 
- Gary Oldman, who plays Sirius Black in the Harry Potter films, played Vlad the Impaler in a 1992 film.
- Harry Potter and the Prisoner of Azkaban (video game) (Mentioned on a Famous Wizard Card)