After the emperor had reached his maturity, however, Mototsune invented the position of kampaku regent for himself. This innovation allowed the Fujiwara clan to tighten its grip on power right throughout an emperor's reign.
In 668 Emperor Tenji (reigned 668-671), bestowed the kabane Fujiwarano Ason on Kamatari.
The surname passed to the descendants of Fujiwarano Fuhito (520-605), the second son and heir of Kamatari, who was prominent at the court of several emperors and empresses during the early Nara period.
Fujiwarano Yorinaga sided with the retired emperor in a violent battle in 1158 against the heir apparent, who was supported by the Taira and Minamoto.
FujiwaraMototsune (83691) became the first kanpaku (regent for an emperor who was no longer a minor), a post thereafter customarily held by the head of the clan when an adult emperor was on the throne, while the post of sessh
From 936 until his death in 941, former provincial official Fujiwarano Sumitomo controlled the Inland Sea as a pirate captain, while in eastern Japan an imperial scion, Taira no Masakado, after waging war on his relatives and neighbors, declared himself emperor (940) but was soon killed.
This was the heyday of the Fujiwara clan and the core of the Fujiwara period.