How many languages could Jean-Francois Champollion speak?

Jean-François Champollion, the French scholar known for deciphering Egyptian hieroglyphs, was proficient in several languages. He could speak and read Latin, Greek, Hebrew, Arabic, and several other ancient and modern languages, totaling around 15 languages. His linguistic skills were crucial in his groundbreaking work on the Rosetta Stone and the understanding of ancient Egyptian writing.