This image is a derivative work of the following images: File:China_-_Song_Dynasty_-_cs.svg licensed with Cc-by-sa-3.0 2013-05-02T13:01:04Z Mozzan 840x825
org/licenses/by-sa/3.0CC BY-SA 3.0 Creative Commons Attribution-Share Alike 3.0 truetrue English French Empire Song en 1111 determination method: SHA-1