Final answer:
The Rosetta Stone was key to the legacy of ancient Egypt as it enabled the translation of hieroglyphs, changing the world's understanding of Egyptian society.
Step-by-step explanation:
The Rosetta Stone was key to the legacy of ancient Egypt as it enabled the translation of hieroglyphs. It was discovered in 1799 and provided the key to understanding the ancient Egyptian writing system. Before the Rosetta Stone was deciphered, hieroglyphics were essentially a mystery to Egyptologists, but its decipherment changed the world's understanding of Egyptian society and contributed to a growing knowledge of ritual, history, political succession, and cultural changes recorded in temples.