From A Wiki of Ice and Fire
|Allegiance||House Vance of Wayfarer's Rest|
|Father||Ser Karyl Vance|
|Book||A Feast for Crows (appendix)|
Emphyria Vance is a noblewoman of House Vance of Wayfarer's Rest. She is the third and youngest daughter of the heir of Wayfarer's Rest, Ser Karyl Vance.
Behind the Scenes
Emphyria is likely a reference by George R. R. Martin to Emphyrio by Jack Vance.