The first Nihongi Koen was held in 721, but it presumed to have had slightly different characteristics from those in later years because it is thought to have held a celebration for the completion of the "Nihonshoki."
721年（養老5年）に最初の講筵に行われたが、これは『日本書紀』完成を祝したものと考えられ、後世のものとやや趣が異なっていると見られる。