Grotefend's contribution to Old Persian is unique in that he did not have comparisons between Old Persian and known languages, as opposed to the decipherment of the Egyptian hieroglyphics and the Rosetta Stone. All his decipherments were done by comparing the texts with known history. However groundbreaking, this inductive method failed to convince academics, and the official recognition of his work was denied for nearly a generation. Grotefend published his deductions in 1802, but they were dismissed by the Academic community.