Decipherment of cuneiform
The decipherment of cuneiform began with the decipherment of Old Persian cuneiform between 1802 and 1836. The first cuneiform inscriptions published in modern times were copied from the Achaemenid royal inscriptions in the ruins of Persepolis, with the first complete and accurate copy being published in 1778 by Carsten Niebuhr.
Source: Wikipedia — Decipherment of cuneiform (CC BY-SA 4.0)