When it comes to the idiom involving the phrase "own accord", is it considered correct to say "on one's own accord", instead of "of one's own accord"? To me, the former sounds more natural. Example: "the autodidact enjoyed learning on her own accord".
I agree with Andreas: I have never heard "on" used with "own accord" before. Furthermore looking at a google ngram of "on your own accord" vs. "of your own accord" shows that "of" is an order of magnitude more common.
The phrase "of own accord" is also listed in the idiom dictionary at dictionary.com and used as a frequent example in definitions of "accord", whereas "on" is not.
I think "on one's own accord" is simply incorrect.