|"Well, I think we should put it back in order for them, don't you?"|
At least some content in this article is derived from information featured in Harry Potter: Puzzles & Spells, Harry Potter: Wizards Unite, and Harry Potter: Hogwarts Mystery.
|"Is this all real? Or has this been happening inside my head?"
The topic of this article is of a real-life subject 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 existed), and, as such, details contained in this article may differ from real world facts.
Seven is the most powerful magical number, based on centuries of mythology, science, and mathematics, and therefore has a very important role in the wizarding world. Arithmancer Bridget Wenlock was the first to note this through a theorem which exposed the magical properties of the number seven. It is likely based off the saying "lucky number seven".
The Arithmancer, Bridget Wenlock (1202–1285) was the first witch to establish the magical properties of the number seven. She wrote her ground-breaking theorem on the back of a sugar packet, using her usual invisible ink. She then proceeded to send her cousin a letter, forgot where she wrote the theorem, and thought it was on the envelope. She hunted down the envelope and intercepted it at her cousin's house, where she learned her mistake.
Seven seen in the wizarding world
- "Weasley" contains seven letters.
- "Granger" contains seven letters.
- The following people have seven syllables in their full names:
- The names Lily Evans and James Potter have seven syllables altogether.
- The Arithmancy professor, of Hogwarts, is named Septima Vector.
- Septimus Malfoy and Septimus Weasley have a shared first name that translates to "seventh" in Latin.
- Marvolo, Tom Riddle's middle name, has seven letters in it.
- If the letters of the alphabet were turned into numbers (A=1, B=2, etc...), the letters in the name Harry would add up to 70. (8+1+18+18+25=70)
- If the letters of the alphabet were turned into numbers (A=1, B=2, etc...), and added together until a single number is found, as done in Arithmancy, the letters in the name Harry result in the number 7. (8+1+18+18+25=70, 7+0=7)
- "Bridget" and "Wenlock", the first and last names of the person who established the magical properties of seven, both contain seven letters.
- Molly and Arthur Weasley had seven children.
- Thaddeus Thurkell had seven children, all Squibs.
- Walter Parkin had seven children.
- Violet Tillyman and Myron Otherhaus had seven children.
- Harry Potter paid seven Galleons for his wand at Ollivanders.
- There are seven letters in both 'Sickles' and 'Galleon'.
- Children go to school at Hogwarts for seven years.
- There are seven floors at Hogwarts.
- There are seven Core classes, which are taught at Hogwarts:
- The Marauder's Map shows seven secret passages out of the school (the map does not show the Room of Requirement).
- There are seven hundred fouls in Quidditch.
- There are seven players on a Quidditch team.
- There is a broomstick named Cleansweep Seven.
- Harry caught seven Golden Snitches during his time as Seeker on the Gryffindor Quidditch team:
- The Wolfsbane Potion must be drunk every seven days before full moon.
- Harry followed the alternate instructions in the Half-Blood Prince's copy of Advanced Potion-Making, by instead stirring his potion once clockwise after every seventh stir anti-clockwise. This helped him achieve much better results than the standard instructions, and earn Slughorn's praise.
- There are seven ingredients of Polyjuice Potion.
- The Wizarding Schools Potions Championship was held every seven years, on years divisible by seven.
- Gilderoy Lockhart assigned seven books for his students in the 1992–1993 school year:
- Hermione Granger stated that 'Alohomora' was in chapter seven of The Standard Book of Spells.
- There are (most likely) seven Standard Book of Spells, one for each year.
- The Unforgivable Curses were first classified as Unforgivable in 1717.
- Many spells such as Protego, Reducto, Imperio, Expulso, Depulso, Anapneo, and Stupefy have seven letters in their incantations.
- The prophecy about Harry Potter defeating Tom Riddle noted that: "The one with the power to vanquish the Dark Lord approaches ... born to those who have thrice defied him, born as the seventh month dies ... and the Dark Lord will mark him as his equal...".
- In the wizarding world, wizards and witches come of age at the age of seventeen, instead of eighteen.
- Seven people come out of the Shrieking Shack in 1994 after Peter Pettigrew's crimes are uncovered:
- There are seven obstacles leading up to the Philosopher's Stone:
- The Philosopher's Stone was kept in Vault 713 in Gringotts Bank.
- Seven entities were attacked by the Basilisk during the 1992–1993 school year:
- There are seven snakes on the door of the Chamber of Secrets.
- There are seven locks on Professor Moody's trunk.
- There were seven Potion bottles in the last task in the Philosopher's Stone chambers.
- Seven muggles saw Ron and Harry in the Flying Ford Anglia.
- Seven keepers for every dragon for the first task of the Triwizard Tournament.
- Mr Weasley won seven hundred Galleons in the Daily Prophet draw.
- From the Great Hall, Harry, Ron, and Hermione climb seven staircases to reach the tower that houses Professor Trelawney's classroom at the top.
- The Battle of the Seven Potters occurred on 27 July 1997.
- Harry was introduced to the Order of the Phoenix when it had nine members, but he did not know who seven of them were beforehand.
- Blaise Zabini's mother had been married seven times as of 1996.
- Snape removes seventy points from Gryffindor when Harry showed up at Hogwarts late in 1996 (fifty for lateness and twenty for Harry's Muggle attire).
- Dumbledore showed Harry seven memories about Voldemort's past (including both the fake and real Horcrux memory).
- Voldemort made seven Horcruxes, even though he believed that six Horcruxes would create a seven-fragment soul (including the piece of soul in his body). The singular of Horcruxes (Horcrux) is seven letters long.
- There are seven "Potters" during the Battle of the Seven Potters:
- There are also seven main conflicts between 1997-1998, the latter part of the Second Wizarding War:
- Seven prisoners escape from Malfoy Manor:
- Harry Potter escaped death at the hands of Lord Voldemort seven times before finishing him off:
- Harry Potter and Ron Weasley received seven O.W.Ls for their Ordinary Wizarding Level examinations. Hermione Granger continued with seven subjects during her sixth year.
- Harry helped Gryffindor beat Slytherin for the House Cup for the first time in seven years.
- Sybill Trelawney believes that the Seven of Spades means an ill omen.
- When a wizard turns seven years old, they start showing magical properties.
- There are seven described uses for the Room of Requirement:
- Hiding objects, as performed by Tom Riddle, Harry Potter, Draco Malfoy, and Sybill Trelawney
- A restroom, as used unintentionally by Dumbledore
- Recuperating from drunkenness, as used by Dobby for Winky
- Finding cleaning materials, as used by Filch
- Hosting D.A. meetings
- Hiding from Filch, as used by Fred and George
- Hiding from the Carrows, as demonstrated first by Neville
- Frank Bryce was nearing his 77th birthday when he was murdered by Voldemort.
- The Triwizard Tournament in 1994 took place 7 centuries after the first one.
- On Christmas Day of 1994, after receiving socks as a present from Harry, Dobby told him that he now had seven pairs of socks.
- In 1996, Bellatrix Lestrange asked Severus Snape seven questions regarding to his loyalty to Lord Voldemort:
- Where was he when Voldemort fell
- Why did he never make any attempt to find Voldemort
- What has he been doing during the period between Voldemort's fall and rebirth
- Why did he stop Voldemort from procuring the Philosopher's Stone
- Why did he not return to Voldemort immediately when all Death Eaters were summoned
- Where was he during the Battle of the Department of Mysteries
- Why is Harry Potter still alive despite being under his mercy for five years
- Harry Potter's chocolate frog card stated that he was famous for seven reasons:
- Being the first and only known wizard to have survived the killing curse.
- Being the youngest seeker in a century, having gained a spot on the Hogwarts Gryffindor Quidditch team in 1991 at only eleven years old.
- Finding and opening Salazar Slytherin's Chamber of Secrets in his second school year and defeating the monster within, which was a Basilisk.
- Being the youngest competitor of the Triwizard Tournament and winner of said tournament in 1995.
- Being the only known Gryffindor student that can speak Parseltongue.
- Being the last master of death to have united the three Deathly Hallows
- Defeating the most dangerous dark wizard of all time, Lord Voldemort, in 1998.
- Nicolas Flamel is seven years older than his wife.
- During Harry's hearing in the Ministry (in 1995), Dumbledore stated that clause 7 of the Decree for Reasonable Restriction of Underage Sorcery allows the use of magic in life-threatening situations.
- There was a total of seven known registered Animagi in the twentieth century.
- Minerva McGonagall became an Animagus by the age of seventeen. 
- One of the ingredients for the Animagus potion is a silver teaspoon of dew that had not seen sunlight or been touched by human feet for seven days.
- Wendelin the Weird was captured and burnt at the stake forty-seven times. 
Behind the scenes
- The first book was released in 1997, and the final book was released in 2007.
- The epilogue itself is set in 2017.
- Many fans expected Harry Potter and the Deathly Hallows (the seventh book) to be released on 07/07/2007, which also happened to be a Saturday, the day upon which Harry Potter books had previously been released. However, it was released on July 21st of that year instead, two weeks later. It is thought that the more 'magical' date was rejected due to it also being the second anniversary of the 7/7 London Bombings in 2005. (21 is still a multiple of 7 though.)
- On 7 August, the Harry Potter series won seven awards at the 2011 Teen Choice Awards for Deathly Hallows: Part 1 and Part 2.
- The Battle of Hogwarts in on 2 May, the 2nd day of the 5th month. 2+5 = 7
- The first film in the Fantastic Beasts and Where to Find Them trilogy is set 70 years before the Harry Potter series.
- There are seventeen chapters in the first book.
- If you count the epilogue, there are thirty-seven chapters in the seventh book.
- The first years enter the castle in the seventh chapter of the first book.
- Chapter four of Harry Potter and the Deathly Hallows is entitled "The Seven Potters".
- There are seven books in the Harry Potter series, and eight movies.
- In the films, Voldemort is played by seven actors: Richard Bremmer, Ian Hart, Christian Coulson, Ralph Fiennes, Hero Fiennes-Tiffin, Frank Dillane and by Michael Berendt although the latter's scenes were cut and never seen.
- J. K. Rowling stated in interview that the "big seven" in the Harry Potter series are: Harry Potter (Daniel Radcliffe), Hermione Granger (Emma Watson), Ron Weasley (Rupert Grint), Ginny Weasley (Bonnie Wright), Neville Longbottom (Matt Lewis), Luna Lovegood (Evanna Lynch), and Draco Malfoy (Tom Felton).
- The number on the back of Harry Potter's Quidditch robes in the films is seven (this could be a reference to the fact that usually the best player/captain in a football team, has the number 7 shirt).
- J. K. Rowling stated in interview that she chose to write seven books in total because she spent seven years in secondary school. Also, she wanted Harry to come of age at seventeen because it "just seems a good number for a wizard to come of age."
- In the seventh Harry Potter book, J.K. split the dedication in seven parts.
- There were seven clues and seven opportunities to sign up and register for the Pottermore beta. The first clue was on 31 July 2011 (Harry's birthday) and the final was 6 August 2011. A clue was released each day and each clue was from a book in the series corresponding to the day. For example, day one's clue was from Philosopher's Stone and the final clue was from Deathly Hallows.
- In Harry's copy of Fantastic Beasts and Where to Find Them, he wrote in the Pixie section for the classification, and put seven X's: "or XXXXXXX if you're Lockhart."
- Seven is also a unique number, being the highest, single-digit prime number.
- Harry Potter and the Philosopher's Stone (First appearance)
- Harry Potter and the Philosopher's Stone (film)
- Harry Potter and the Philosopher's Stone (video game)
- Harry Potter and the Chamber of Secrets
- Harry Potter and the Chamber of Secrets (film)
- Harry Potter and the Chamber of Secrets (video game)
- Harry Potter and the Prisoner of Azkaban
- Harry Potter and the Prisoner of Azkaban (film)
- Harry Potter and the Prisoner of Azkaban (video game)
- Harry Potter and the Goblet of Fire
- Harry Potter and the Goblet of Fire (film)
- Harry Potter and the Goblet of Fire (video game)
- Harry Potter and the Order of the Phoenix
- Harry Potter and the Order of the Phoenix (film)
- Harry Potter and the Order of the Phoenix (video game)
- Harry Potter and the Half-Blood Prince
- Harry Potter and the Half-Blood Prince (film)
- Harry Potter and the Half-Blood Prince (video game)
- Harry Potter and the Deathly Hallows
- Harry Potter and the Deathly Hallows: Part 1
- Harry Potter and the Deathly Hallows: Part 1 (video game)
- Harry Potter and the Deathly Hallows: Part 2
- Harry Potter and the Deathly Hallows: Part 2 (video game)
- Harry Potter and the Cursed Child
- Harry Potter and the Cursed Child (play)
- Fantastic Beasts and Where to Find Them: The Original Screenplay
- Fantastic Beasts and Where to Find Them (film)
- Fantastic Beasts: The Crimes of Grindelwald - The Original Screenplay
- Fantastic Beasts: The Crimes of Grindelwald
- Quidditch Through the Ages
- Fantastic Beasts and Where to Find Them
- The Tales of Beedle the Bard
- Wizarding World
- J. K. Rowling's official site
- Daily Prophet Newsletters
- Harry Potter Trading Card Game
- Harry Potter: The Character Vault
- Harry Potter: The Creature Vault
- LEGO Harry Potter: Building the Magical World
- LEGO Harry Potter: Characters of the Magical World
- LEGO Creator: Harry Potter
- Creator: Harry Potter and the Chamber of Secrets
- LEGO Harry Potter: Years 1-4
- LEGO Harry Potter: Years 5-7
- LEGO Dimensions
- LEGO Harry Potter
- Harry Potter: Quidditch World Cup
- Wonderbook: Book of Spells
- Wonderbook: Book of Potions
- Harry Potter for Kinect
- Harry Potter: Spells
- Fantastic Beasts: Cases from the Wizarding World
- Harry Potter: Hogwarts Mystery
- Harry Potter: Wizards Unite
- Harry Potter: Puzzles & Spells
Notes and references
- Harry Potter and the Half-Blood Prince, Chapter 23 (Horcruxes)
- J. K. Rowling's official site
- Wonderbook: Book of Spells
- Harry Potter and the Deathly Hallows, Chapter 11 (The Bribe)
- Harry Potter and the Philosopher's Stone, Chapter 6 (The Journey from Platform Nine and Three-Quarters)
- Harry Potter and the Chamber of Secrets (video game)
- Quidditch Through the Ages
- Harry Potter and the Philosopher's Stone, Chapter 5 (Diagon Alley)
- Harry Potter and the Philosopher's Stone, Chapter 8 (The Potions Master)
- Harry Potter and the Prisoner of Azkaban, Chapter 10 (The Marauder's Map)
- Harry Potter and the Order of the Phoenix, Chapter 18 (Dumbledore's Army)
- Harry Potter and the Prisoner of Azkaban, Chapter 18 (Moony, Wormtail, Padfoot and Prongs)
- Harry Potter and the Chamber of Secrets, Chapter 12 (The Polyjuice Potion)
- Wonderbook: Book of Potions - The first Championship was known held in 1407, which is a multiple of seven. Since the event was held every seven years, unless there were irregularities, every subsequent Championship was also held in a year divisible by seven.
- Harry Potter and the Chamber of Secrets, Chapter 4 (At Flourish and Blotts)
- Harry Potter and the Philosopher's Stone, Chapter 9 (The Midnight Duel)
- The Tales of Beedle the Bard
- Harry Potter and the Order of the Phoenix, Chapter 34 (The Department of Mysteries)
- Harry Potter and the Half-Blood Prince, Chapter 3 (Will and Won't)
- Harry Potter and the Philosopher's Stone, Chapter 16 (Through the Trapdoor)
- Harry Potter and the Chamber of Secrets, Chapter 16 (The Chamber of Secrets)
- Harry Potter and the Goblet of Fire, Chapter 35 (Veritaserum)
- Harry Potter and the Chamber of Secrets, Chapter 5 (The Whomping Willow)
- Harry Potter and the Goblet of Fire, Chapter 19 (The Hungarian Horntail)
- Harry Potter and the Prisoner of Azkaban, Chapter 1 (Owl Post)
- Harry Potter and the Prisoner of Azkaban, Chapter 6 (Talons and Tea Leaves)
- Harry Potter and the Deathly Hallows, Chapter 4 (The Seven Potters)
- Harry Potter and the Half-Blood Prince, Chapter 7 (The Slug Club)
- Harry Potter and the Half-Blood Prince, Chapter 8 (Snape Victorious)
- Harry Potter and the Deathly Hallows, Chapter 23 (Malfoy Manor)
- Harry Potter and the Philosopher's Stone, Chapter 17 (The Man with Two Faces)
- Harry Potter and the Goblet of Fire, Chapter 1 (The Riddle House)
- Harry Potter and the Goblet of Fire, Chapter 12 (The Triwizard Tournament)
- Harry Potter and the Goblet of Fire, Chapter 23 (The Yule Ball)
- Harry Potter and the Half-Blood Prince, Chapter 2 (Spinner's End)
- Harry Potter and the Order of the Phoenix, Chapter 8 (The Hearing)
- Michael Berendt's website.
- SnitchSeeker - J.K. Rowling Talks Harry Potter and the Deathly Hallows: Part 2