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.
What is Chan Chan in relation to the Chimu culture?
Chan Chan was a large adobe city in the Moche Valley of present-day Trujillo, Peru.
Who was at the top of the Chimu hierarchy?
Chan Chan was the top of the Chimu hierarchy, with Farfán in the Jequetepeque Valley as a subordinate.
What is an interesting fact regarding the rule of Chimu culture?
The Chimú are best known for their distinctive monochromatic pottery and fine metal working of copper, gold, silver, bronze, and tumbaga (copper and gold).

Question: when did the hierarchy begin?
Self-contained rewrite: When did the Chimu culture hierarchy begin?