Which Fujiwara branch became the most influential branch of the family?

The Hokke, or Northern Branch, became the most influential branch of the Fujiwara family.1

Following the death of Fujiwara Fuhito, his four sons each established a separate branch of the family. Among these, the Hokke rose to prominence and eventually dominated the Japanese imperial government from the 9th to the 12th century through strategic intermarriage and political maneuvering.12