While most French silent films on Greco-Roman Antiquity in the collection of the British Film Institute are Pathé and Gaumont productions, a rare example is a film by the company Éclipse: Bélisaire (1910). It not only refers to a historical figure. It also relies on a long tradition of French literature, theatre and painting concerning the Byzantine general, while deviating from it in intriguing ways. Little is known about the film and who made it, and the actors remain unidentified. Yet, some information is known about the company that produced it: Éclipse. So detective work has been required to analyse this unusual antiquity film.