The word 'original' came about in the 18th Century

1. The very idea of, and the centrality to our culture of, 'the individual', has been seen as an ideological conception, a product of the capitalist revolution in the late seventeenth century. In support of this idea one might note that the "rights of the individual" were not theorized until the eighteenth century, and wonder whether humankind just hadn't been bright enough to think of them until then, or if the centrality of the concept 'the individual' is an historical phenomenon. There are various claims that the idea of "the author" was not a significant concept before this time. In partial support of this it might be noted that the use of the word "original" in a positive sense to refer to 'authored' texts, paintings, etc., did not occur until the late eighteenth century, not long after, for instance, the emergence of the idea that individual actors might give their own interpretations of roles,

Source https://brocku.ca/english/courses/4F70/author.php