What discovery led the ability to decode hieroglyphics?

The Rosetta Stone led to the ability to decode hieroglyphics
Archaeologists found the Rosetta Stone. The Rosetta Stone had many languages on it including hieroglyphics.Later on college students figured out the secret of hieroglyphics.
The Rosetta stone found by some person, and deciphered 24 years later. it was writen in three different languages. Hieroglythics, greek and something else.