What discovery allowed for the translation of egyptian hieroglyphics?

Rosetta Stone  Explanation: In 1822, a French Egyptologist called Jean Francois Champollion (1790-1832) was the first person to translate all the hieroglyphs on the stone. He discovered that it was a piece of writing in praise of the good works of the pharaoh Ptolemy V and that it was carved in 196 BC.hope this hepls pls thanks