The reign of Husraw I Anosirwan / Chosroes (531-579), the most remarkable one during the Sasanian dynasty, was pivotal in the history of Iran. During that period, far-reaching projects to restructure the state affected all strata of society, royal power was strengthened and the country experienced significant cultural development. No major scientific gathering was devoted to this subject, and here are published the proceedings of a symposium organized in Paris. Its aim was to bring together international scholars from various fields who work on often difficult-to-access or hitherto unpublished source material in several languages. The resulting interactions and intersecting perspectives help to piece together many facets of that reign, thus providing a rich contribution to the history of the East in the 6th century.