natuar language of babies

There was an English king, I think in the 17th century who wanted to know what language babies naturally speak.
He had babies deprived of hearing any human language since birth. He thought they would speak Hebrew!
Can you tell me more of this story?
Thank you

Googling produced this:

However I started by knowing already it was Frederick–although I don’t think he was the only one who ever tried this.

The story Hilarity linked to was mentioned earlier in this post and the following one. That thread was interesting.