Portraits of Periodical Offering
The Portraits of Periodical Offering (simplified Chinese: 职贡图; traditional Chinese: 職貢圖; pinyin: Zhígòngtú) were tributary documentative paintings (with illustration on each of the portrait) produced by various Chinese dynasties and later as well in other East Asian dynasties, such as Japan and Vietnam. These paintings were official historical documents by the imperial courts.
Source: Wikipedia — Portraits of Periodical Offering (CC BY-SA 4.0)