Perhaps this may be of use to you.
The low area between the Quirinal hill and the Palatine was the subura, definitely built up when Caesar lived there in the 1st century BC. Lots of markets etc there (and apparently a dangerous area).
The Campus Martius was probably built up by the 1st century BC, since Julius Caesar was killed at the theater of Pompey (irony?), which stood there.
The 'corner' across the river had the Pagus Janiculensis, which was settled early on.
No-one had lived on the Capitoline hill since the early days of the republic, so that is largely temple, including the great temple of Jupiter Optimus temples
The Aventine was the traditional home of the plebeians.
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