In the modern world, the technology to monitor your every movement and action is imminently feasible. No one doubts the ability of an omni-government to monitor people; hence GDPR.
But Orwell posited such a controlling government in Nineteen Eighty-Four, published in 1949.
What is the earliest point in human history that a government (of any sized society) could achieve a Nineteen Eighty-Four-like control of its population?
Here are some relevant attributes of the government in Nineteen Eighty-Four; with spoiler tags because I'm sensitive to those who have put off reading the book for 69 years.
Constant surveillance of the population (thoughthrough 'telescreens', possibly)
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The ability to project a fictitious but omni-present leader, Big Brother, who 'always' rules no matter who rules behind the scenes
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The apparent high-probability chance of detecting rebels before they even act