Among the samurai classes, the most powerful are two surnames, namely "Pingjia" and "Genjia". Pingjia was initiated by Pingqingsheng, who was actually a representative figure who initiated the prosperous era of samurai class, and was initiated by Yuan Laichao, who was a little later than Pingqingsheng, but Yuan Laichao was the first shogunate ~
The emergence of Ping Qingsheng made the samurai class master the real power, but Ping Qingsheng did not replace the emperor. After decades of actual rule in Japan, the emergence of Genlaichao broke the monopoly of the Ping family on the ruling power of the samurai class, and finally defeated the Ping family and became the representative of the samurai class. Later, he founded the shogunate and raised the emperor. However, after the death of Yuan Laichao, there was civil strife in Genlaijia, and General Genji actually took power.
Xuanping's hegemony is a strong stroke in Japanese history. The above mentioned is just the beginning of the black hegemony. In fact, most of the leading figures in Japan's later period are descendants of two families in Xuanping. For example, Nobunaga is the representative of the Xuanping family, and Tokugawa Ieyasu, who finally became a shogunate, is the descendant of Genji ~
By the way, there is an unwritten rule in Japanese history that you can't be a general unless you are descended from two big families ~ That's why Toyotomi Hideyoshi is only a "white man" and not a "general" ~
Considering that the last Tokugawa family came from Genji, it can be said that, comparatively speaking, the most powerful surname in Japan is Genji.