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Inquiring minds often seek to understand the historical context of events, and the question of "When did the polis end?" is a profound one that delves into the heart of ancient Greek civilization. The polis, or city-state, was a fundamental unit of governance and social organization in Ancient Greece. It encompassed a variety of political systems, ranging from monarchies to democracies, and played a pivotal role in shaping Western political thought and institutions. However, the demise of the polis was not a sudden event, but rather a gradual process that occurred over centuries. Could you elaborate on the factors that contributed to the decline of the polis and pinpoint a specific timeframe in which it ultimately came to an end?