The earliest answer has been at the hands of the elves of Brithos (according to Cults of Terror).
But that dating doesn't work. Arkat was born during the Sunstop and there would have to be a free and unimpeded transmission of ideas from Dorastor to Brithos within 13 years whereas it was anything but.
My guess is that the "Arkat was Illuminated" was a slander put about by the God Learners to defame Arkat - since they couldn't understand either illumination or Arkatism, they declared that both were two sides of the same coin and both had to be eradicated.
At the same time, I believe that the God Learner slander contained an unwitting element of truth. For Arkat was Nysalor's Shadow born during the Sunstop and just as so Nysalor spread light and illumination, Arkat felt compelled to spread gloom and benightenment. In his madness and in his heroquesting, he achieved a metaphysical state of awareness that he taught to others and which the God Learners slurred as Illumination.
--Peter Metcalfe
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