House of Fujiwara
Arguably the most powerful part of the Japanese monarchical system besides the Yamato Dynasty itself, the House of Fujiwara, provided regents and empresses from 645 to 1945. In legend, the father of the Fujiwaras was one of the three key aides to the first Emperor, Jimmu.  They had become prominent after the Taika reforms, simply in holding the greatest number of private estates and government jobs.
- Jerrold M. Packard (1989), Sons of Heaven: A Portrait of the Japanese Monarchy, Macmillan, ISBN 0020232810, pp. 68-69
- Edwin O. Reichshauer (1977), The Japanese, Harvard University Press, p. 51