Behistun Inscription
From 1841 to 1844 he journeyed throughout India and Persia, where he conducted important investigations in Bombay and at Persepolis. In 1844 he began deciphering ancient Elamite cuneiform using the 3-way parallel text of the 6th cent. BC Behistun Inscription, finding 96 syllabic signs, 16 ideograms, and 5 determinants.