Rosehall is the name of an unknown location.
In A Court of Frost and Starlight, Azriel mentioned to Rhysand that he was headed to Rosehall the morning after Solstice but he needed to do some shopping first.
Rhysand then tells him to buy "her" something nice on his behalf, and put it on his account but he knew Azriel wouldn't but he still nodded.
- (Mentioned only)
- Since Rhysand tells Azriel to buy "her" something nice on his behalf, "her" could be referring to Azriel's mother.
- Rosehall is connected to Azriel and possibly his mother.