Charles Buck Theological Dictionary
Heretics who paid divine worship to Seth, whom they looked upon to be Jesus Christ, the Son of God, but who was made by a third divinity, and substituted in the room of the two families of Abel and Cain, which had been destroyed by the deluge. They appeared in Egypt in the second century; and, as they were addicted to all sorts of debauchery, they did not want followers. They continued in Egypt above two hundred years.
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Buck, Charles. Entry for 'Sethians'. Charles Buck Theological Dictionary. https://www.studylight.org/dictionaries/eng/cbd/s/sethians.html. 1802.