The Roman conquest of Egypt occurred in 30 BC, marking the end of the ancient Egyptian period.
Notes on verification
Multiple independent authoritative sources including Wikipedia, Metropolitan Museum of Art, and specialized Egypt history sites all corroborate both the date (30 BC) and the significance (end of ancient Egyptian period). There is minor scholarly nuance about alternative end dates (395 CE for religious transformation), but 30 BC as the end of independent ancient Egypt is the widely accepted consensus.
Sources
- History of ancient Egypt (wikipedia)