Conversation so far:
What did the rule of the Chimu culture consist of?
The Chimú society was a four-level hierarchical system, with a powerful elite rule over administrative centers. The hierarchy was centered at the walled cities, called ciudadelas, at Chan Chan.
Where were the Chimu located?
The Chimú culture was centered on Chimor with the capital city of Chan Chan, a large adobe city in the Moche Valley of present-day Trujillo, Peru.
Who was at the bottom of the Chimu hierarchy?
The existing elite at peripheral locations, such as the Jequetepeque Valley and other centers of power, were incorporated into the Chimú government on lower levels of the hierarchy.

Question: What is Chan Chan?
Self-contained rewrite: What is Chan Chan in relation to the Chimu culture?