Word trivia puzzle

They are doing a word puzzle game at work and I can’t get this one. I tried search, but am still empty handed. So here goes…

Example:

___W on __ U

1 wheel on a unicycle

Here’s the one we can’t get:

1000 A.N.

What is this?
The common answer is 1000 arabian nights, which we know is spelled with a K. So we need your help.
Thanks!!

Arabian Nights is correct (from the book). Why would you think it would be Knights?

Haj

Thought the number was 1001.

Oooh I like this sort of puzzle. Ask more!

Oh, I haven’t seen that one in years. Please post the whole list.

A lot of them can be found here.

But were there others you couldn’t get that we could jump in on?

19th N.B.

19th Nervous Breakdown

I thought it was “1001 A.N.” and “1000 = W. a P. is W.”