Which court does Xi'an belong to? Is there a map of the Quincunx courts?
I know there is a map in Blood and Silk, but the Quincunx didn't exist yet.
Should be the capital of the of Jade Court. (Xi'an was formerly called Chang'an; see page 157 rulebook). It had a very important role in Blood and Silk and Wind from the East. If you're playing a modern-times chronicle, I'd place some really old Wu there that reminisce the times where they had much power.