At about the same time, Anquetil-Duperron came back from India, where he had learnt Pahlavi and Persian under the Parsis, and published in 1771 a translation of the "Zend Avesta", thereby making known Avestan, one of the ancient Iranian languages. With this basis, Antoine Isaac Silvestre de Sacy was able to start the study of Middle Persian in 1792-93, during the French Revolution, and he realized that the inscriptions of Naqsh-e Rostam had a rather stereotyped structure on the model: "Name of the King, the Great King, the King of Iran and Aniran, son of N., the Great King, etc...". He published his results in 1793 in "Mémoire sur diverses antiquités de la Perse".