The text asks the reader to recall when Russia became an empire, implying that this was a significant event associated with the era of Peter the Great, Catherine's predecessor. While the text focuses on Catherine's reign, it frames it within the context of Russia as an empire, suggesting that the imperial status was established prior to her rule.
Conclusion: The text places Catherine the Great's reign within the context of Russia already being an empire, an status established earlier, likely during Peter the Great's time.