This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Study Notes of Zhao Gongwu. Series title npm gov tw html PDold Image page zh Institution National Palace Museum Collections of the National Palace Museum Zhao Gongwu Zhao Xibian Song Dynasty
Page 2023 Free-images.com. All images are Public Domain