[Why did Robert Plant hate David Covedale?]

On 2/11/2008 at 2:19 PM, ledsabbath said:

Hi all. I read from another poster that apparently Robert Plant called David Covedale, "David Coverversion". What's the story behind that?

 

I read a long time ago that when Jimmy Page recorded the "Coverdale/Page" album, it was a slap in the face to Robert Plant.

 

So what is the story of Robert's animosity towards David Covedale?