The title used during the Qin Dynasty was emperor.
The title used during the Qin Dynasty to refer to the ruler was "emperor." To find this answer, you could use various resources such as history books, encyclopedias, or reliable websites that provide information on the Qin Dynasty. These sources would typically explain the political structure of the Qin Dynasty and the title used by the ruler. By consulting multiple sources, you can ensure the accuracy of the information you find.
