"In case you’re getting ideas, I might tell you that you can trace my family back through nine generations of witches and warlocks and my blood’s as pure as anyone’s."
— Macmillian family history[src]

Macmillan was the surname of a pure-blood[1] wizarding family, and one of the Sacred Twenty-Eight.[4] By the 1990s, the family was comprised of nine consecutive generations of pure-bloods[1] - as, through Melania Black (née Macmillan), they were distantly related to the Black and Prewett families.[5]


Later generations of Macmillans may have been considered "blood traitors", since Ernie Macmillan had friends of other blood statuses[6] and fought against Death Eater ideals as a member of Dumbledore's Army.[7] However, the Macmillans were seemingly more respectable in pure-blood circles than a family such as the Weasleys, since Melania Macmillan married into the highly prejudiced House of Black.[5]

In regards to this, it is quite possible that the Macmillans (like the Weasley family) either deplored their inclusion among the Sacred Twenty-Eight or simply did not care whom they were associated with. They were also staunch supporters of Albus Dumbledore, as was claimed by Ernie, and did not believe the slanderous accusations levied against him by the Ministry in 1995.

Family Members

Wizard(s) Notes
Ernie Macmillan Hufflepuff student in Harry Potter’s year at Hogwarts School of Witchcraft and Wizardry
Melania Black (née Macmillan) Wife of Arcturus Black III, paternal grandmother of Sirius Black
Pippa Macmillan Gryffindor student at Hogwarts School of Witchcraft and Wizardry in the 1980s


Macmillan is a surname of Scottish origin. Clan MacMillan is a Highland Scottish clan dating back to at least the fourteenth century; Harold Macmillan was a British Prime Minister.


Notes and references

  1. 1.0 1.1 1.2 Harry Potter and the Chamber of Secrets, Chapter 11 (The Duelling Club) - "“It was a very near miss,” said Ernie. “And in case you’re getting ideas,” he added hastily, “I might tell you that you can trace my family back through nine generations of witches and warlocks and my blood’s as pure as anyone’s, so —”"
  2. Harry Potter: Hogwarts Mystery, Year 2, Side Quest "Lone Wolf"
  3. This may be the case with Melania Black née Macmillan, as Horace Slughorn has claimed that all Blacks were Sorted into Slytherin. However, this may not included spouses.
  4. Writing by J.K. Rowling: "Pure-Blood" at Wizarding World
  5. 5.0 5.1 Black family tree
  6. Harry Potter and the Chamber of Secrets
  7. Harry Potter and the Deathly Hallows

Dumbledore's Army
Harry Potter · Hermione Granger · Ronald Weasley
Harry Potter · Neville Longbottom · Luna Lovegood · Ginny Weasley
Gryffindor ClearBG2.png Gryffindor Katie Bell · Lavender Brown · Colin Creevey · Dennis Creevey · Seamus Finnigan · Angelina Johnson · Lee Jordan · Cormac McLaggen · Parvati Patil · Alicia Spinnet · Dean Thomas · Romilda Vane · Fred Weasley · George Weasley · Nigel Wolpert · Unidentified female · Unidentified female (II)
Dumbledore army.jpg
Ravenclaw ClearBG2.png Ravenclaw Terry Boot · Cho Chang · Michael Corner · Marietta Edgecombe · Anthony Goldstein · Padma Patil · Maisy Reynolds · Unidentified male · Unidentified male (II) · Unidentified female
Hufflepuff ClearBG2.png Hufflepuff Hannah Abbott · Susan Bones · Justin Finch-Fletchley · Ernie Macmillan · Zacharias Smith · Leanne · Unidentified female
Unknown House Luca Caruso · Alice Tolipan
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