Yoritomo and another Ichijo family

During the 65 years from the Hogen War (1156) to the Jokyu War (1221), there was a rapid change of government from the Insei to the Heike to the Minamoto clan to the Hojo clan, but thanks to Yoritomo, "Ichijo family", not Regents Ichijo family, played a role in the era. The Nakamikado clan was an offshoot that began with Yorimune, who was established between Michinaga and Meishi (Takaakira Minamoto's daughter), but Michimoto Fujiwara, who had reached the rank of provincial governor after passing through three generations, He became a close vassal of ex-emperor (Goshirakawa) because he took his sister's wet nurse as his wife, and Michimoto's son Michishige took a wife from the Tokudaiji family, a court noble. Michishige passed away two years after his son Yoshiyasu was born, and his grandmother (Josaimon-in Ichijo) raised him, but because her residence was in Ichijo Muromachi, he was given the name Ichijo. During the Insei(ex-emperor government) period, in order to compete with the Sekkan family, there were many cases in which close vassals from the Fujiwara Northern family were appointed, and this scenario was not uncommon.  

Yoshiyasu married Yoshitomo Minamoto's daughter Bomonhime, and the fate of the Ichijo family suddenly changed. Princess Bomon gave birth to four children, and the heir (Takayoshi) and the other three daughters married Yoshitsune Kujo, Kintsune Saionji, and Tadatsune Kazanin, respectively, and established kinship relationships with the Sekkan family and similar families, and the Ichijo. The family was promoted to the rank of court noble.

Yoritsune, the son of Yoshitsune Kujo's son Michiie and Saionji Kintsune's daughter Rinshi, succeeded the assassinated Sanetomo and became the fourth shogun of the Kamakura shogunate. In other words, the fourth Shogun Yoritsune was the great-grandson of Yoritomo's younger sister Bomonhime. Yoritsune's son Yoritsugu was dismissed after the Battle of Hoji (1249), and Imperial Prince Munetaka, the son of Emperor Gosaga, was appointed as the sixth shogun.

Imperial Prince Munetaka married Michiie Kujo's granddaughter, Saishi Konoe, and her son, Imperial Prince Koreyasu, became the seventh shogun. Afterwards, Emperor Gofukakusa's son, Imperial Prince Hisaaki, who was born between the grandson of Kimitsune Saionji and Emperor Gosaga, succeeded to the 8th generation, and his nanny, Imperial Prince Morikuni, succeeded to the 9th generation, leading to the fall of the Kamakura Shogunate. Kamakura Shogun's direct lineage from Yoritomo ended after three generations, but there were somehow nine generations in the female line.  

In addition to the Kamakura shogun Yoritsune, Michiie Kujo and Rinshi had three sons, each of whom became heirs to the Kujo family and established branch families (Ichijo and Nijo families). Furthermore, Emperor Gosaga enthroned his younger brother Emperor Kameyama after Emperor Gofukakusa, creating the beginning of the Nanbokucho period that lasted for a century and a half.

Although the Nakamikado-ryu Ichijo family continued to try to marry with the Sekkan family and the Hojo clan, there were no court nobles left at the end of the Kamakura period, and the family became extinct during the Nanbokucho period. His marriage with Princess Bomon led to successive Kamakura shoguns, and his lineage was passed on to the heads of three of the five sekke families (Kujo, Ichijo, and Nijo), and furthermore, to the imperial lines of the Northern and Southern Courts, leading to today's imperial family. The death of Yoritomo (1199), who was the biggest supporter, and the Jokyu War (1221) were the biggest difficulties for the family, but the former had the backing of powerful relatives, and the latter had the direct lineage (Yoriuji) from Hojo. He was able to survive because he had taken Tokifusa's daughter as his wife and fled to Kamakura. After that, the Saionji family was responsible for the coordination between the Imperial Court and the Shogunate. It was a house like a supernova that suddenly appeared at the end of the Heian period, shone brightly for over 100 years during the Middle Ages, and then quietly disappeared.