Diablo Wiki
The last chamber (Wynton Courtyard)

Interior of the Courtyard

Wynton Courtyard is a small dungeon that can be found in Westmarch Commons in Diablo III. Inside, the Noble Deaths event takes place, leading the Nephalem to Gorrel and his band slaughtering the nobles as ordered (or perhaps instigated) by Lord Wynton.

Name of the zone implies that Lord Wynton may have been the owner of this place, possibly luring his rivals in there promising shelter.