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fan fiction - Does the Interdict of Merlin appear in original Harry Potter canon?


In Harry Potter and the Methods of Rationality by Eliezer Yudkowsky a concept called the 'Interdict of Merlin' appears: (all emphasis added)


Chapter 23:



His hand on the doorknob, Harry Potter already inside and waiting, wearing his cowled cloak.


"The ancient first-year spells," Harry Potter said. "What did you find?"


"They're no more powerful than the spells we use now."



Harry Potter's fist struck a desk, hard. "Damn it. All right. My own experiment was a failure, Draco. There's something called the Interdict of Merlin -"


Draco hit himself on the forehead, realizing.


"- which stops anyone from getting knowledge of powerful spells out of books, even if you find and read a powerful wizard's notes they won't make sense to you, it has to go from one living mind to another. I couldn't find any powerful spells that we had the instructions for but couldn't cast. But if you can't get them out of old books, why would anyone bother passing them on by word of mouth after they stopped working? Did you get the data on the Squib couples?"



Chapter 25:



Harry had asked Hermione about that earlier - on the train to Hogwarts, after hearing Draco say it - and so far as she knew, nothing more was known than the word itself.


It might have been pure legend. But it was also plausible enough that a civilization of magic-users, especially one from before the Interdict of Merlin, would have managed to blow itself up.


The line of reasoning continued: Atlantis had been an isolated civilization that had somehow brought into being the Source of Magic, and told it to serve only people with the Atlantean genetic marker, the blood of Atlantis.




and Chapter 80:



This is the Hall of the Wizengamot; there are older places, but they are hidden. Legend holds that the walls of dark stone were conjured, created, willed into existence by Merlin, when he gathered the most powerful wizards left in the world and awed them into accepting him as their chief. And when (the legend continues) the Seers continued to foretell that not enough had yet been done to prevent the end of the world and its magic, then (the story goes) Merlin sacrificed his life, and his wizardry, and his time, to lay in force the Interdict of Merlin. It was not an act without cost, for a place like this one could not be raised again by any power still known to wizardkind. Nor yet destroyed, for those walls of dark stone would pass unharmed, and perhaps unwarmed, through the heart of a nuclear explosion. It is a pity that nobody knows how to make them anymore.



Is there any mention at all of the Interdict of Merlin in Harry Potter canon (anything written, spoken of or referred to by J. K. Rowling), or was this simply a plot device added by Eliezer Yudkowsky?



Answer



The Interdict is an added plot device (though something like it must surely exist elsewhere in the vast reaches of already-written fantasy).


I don't regard my own answers as canon when they haven't been recorded in the text itself, but Opinion of God is that the Interdict of Merlin applies to magical secrets that can directly or indirectly lead to wide-scale catastrophes if revealed. (It's possible that Harry's Brown Note for the Patronus Charm would fall into this category, even though it's not a secret that causes a nuclear-scale explosion as such.) Harry Potter and the Methods of Rationality includes instances of people learning relatively strong magic from books (e.g., Tom Riddle and the original horcrux spell), not to mention that Hermione is explicitly shown in-scene to have learned sixteen spells just from reading books. It's implied however that the art necessary to create e.g. the Deathly Hallows, or to raise Hogwarts, was unrecordable and therefore lost.


One way or another, some further assumption is necessary to explain why a literate society doesn't have more and more advanced Invisibility Cloaks every year, far trumping one that's a thousand years old, the way that broomsticks are shown to improve every year. In Harry Potter and the Methods of Rationality, this further assumption is the Interdict of Merlin. This allows a new faster broomstick to come out every year as in canon, while also allowing there to be ancient lost artifacts of unmatched power as in canon. The Interdict wasn't meant as a big weird plot point from nowhere, but as a lawful explanation of observations we'd already seen (one of the central tropes of rationalfic), which then had further consequences (also one of the central tropes of rationalfic).


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