You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "when was the circus maximus built in rome?" whose answer is Old Kingdom era.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when was the circus maximus built in rome
Useful Output:

Doc 1: Though it was first built between 599-500 BC, it was partly destroyed in the great fire of Rome in 64 AD and after it was rebuilt with grand
Doc 2: It was built in the 6th century BC (Alen S). Later in the 1st century BC it was finished by Julius Caesar (Britannica).
Doc 3: It is unclear as to when the first version of the Circus Maximus was constructed – it was certainly the oldest of Rome's arenas and served as a
Doc 4: The Circus Maximus was a chariot racetrack in Rome constructed in the 6th century BCE. Used for other events such as the Roman Games and gladiator fights.
Doc 5: Circus Maximus was built by order of Lucius Tarquinius Priscus in the 6th century BC. Circus Maximus is a venue and is Rome's largest and oldest public space.