When was the most prosperous period in Japan? Where is the main prosperity?

In peacetime. It should be the heyday of culture. It was probably during the Song Dynasty in China, so the cultural peak at that time also fully absorbed China culture. Cultural field: The Tale of Genji, the first novel in the world, was written by the Department of Murasaki Records. Pillow Grass written by Shao Qing Yan Na is in the same period as Murasaki shikibu. The collection of ancient and modern songs seems to have been written by Ji Guanzhi and others, recording the songs of the sun and the six immortals. It has to be said that it is Fujiwara, the father-in-law of the three emperors, who really pushed the Fujiwara family to the highest peak. Military field: Early stage: Ma Lu Bantian, the second general who conquered foreign countries, seems to be of China descent. Later period: Tell a few details and list a few Yuan Yi Jia, the eldest son of the God of War (known as Yuan Yi Jia of An Hong), who was worshipped in the later period before many military commanders went out to war. Borrow a passage from Baidu: the bow and horse techniques, tactics and marching array of Genji clan and even all Kanto warriors. They are all standardized by the Genyi clan and passed down to future generations. -Yuan Lailai, founder of the Kamakura shogunate, endured humiliation and finally overthrew the Pinggu family. Japan's tragic hero Yuan Yijing (I don't think so) actually led the army to defeat Pinggu. The Battle of Temple, the Valley of Surprise and the Battle of the Big Island are all his works. -There are other figures, so I won't introduce them one by one: Ping Qingsheng, Yuan, Yuan, Yuan, Heng Zhong, Ping Chongsheng, Ping Dunsheng (this classic was written by Nobunaga), Ping Zhisheng and Ping Jiaojing, which must be related to Yi (an expert archer) and Yuan.