No one knows the specific date... Only that it happened after the Ancestors where created

So basically in the 1700s between like 1718 and 1766 because New Orleans was created in 1718 and Ysabelle (the witch believed to create the Ancestral Plane) died in 1766?

I would say even after cause it had to be more witches in order to trap Inadu

Sorry for the grammar mistakes...

I would say somewhere after 1776 and Before Vincent lost his child. Due to the fact she was mentioned in spirit form by Vincent when Eva started practicing sacrificial magic.

So that if that evil was running wild for that long why didn’t the Mikaelson’s know that it existed and why wasn’t she wreaking havoc all over NOLA? The Mikaelson’s arrived in 1702 so from what you guys are saying that’s before the ancestral plane was created. I have only seen that season once… so I’m sure there’s a lot I’m missing…🙃

Dude to be honest I don't remember an episode in the entire series telling about the witch and the date that the Ancestral Plane was created

The only thing I remember is that Vincent said Inadu is older even than the ancestors... So taking into account that he knows of the Mickelsons existence, I thought that the ancestors were older... But then I came here and I found out that a witch created somewhen in 1700...