From the introduction:
In time lost to memory, noble Families of the mainland fled to establish Sagrea, ageless city of wonders. There are many tales about why they fled, but truth is long lost and records from the Crossing are scattered and crumbling.
The First Families who undertook the Crossing—also known as the Tretagi—rule a city unparalleled in the known world. Bastard offshoots of Tretagi (and Families ennobled after the Crossing) make up the lesser seed of the Low Families, or Barandi. Nobles find their diversions in art, running city bureaucracy, military leadership and adventurism, and dueling.
The game title changed at each iteration of the challenge: The Wizard, Wizards of Xicarus, and The Perfected City.