I have no knowledge to share with you, but it's gorgeous. You are lucky.

Wow! That is one big hunk of all-right!

I wonder if it is a French colonial piece. It seems to be a Louis XIV or so style interpreted with an Asian flair. Can you tell what the wood is? Can we see a picture of the side rails, and how they fit into the head and foot boards?

What a wonderful, wonderful piece!

It's a rococo revival style. It was first revived in the 1840's, and again at the turn of the 20th century, and reprised after Gone With the Wind brought it before the public once again in the 40's. Which really was a re-revival, focusing on the Old South, not the original European sources.
A furniture vendor called Magnolia Hall was cataloging a lot of stuff similar (but not as nice as this) as late as 1985.
I'm guessing this is from the last incarnation, but it is really good quality of carving. The 1850 stuff is exclusively rosewood. Your headboard appears to be walnut.
Casey