Fujiwara no Naozumi

Fujiwara no Naozumi is known only through genealogies of the Ōmura and Arima warrior houses of Hizen, which called him a grandson of the rebel Fujiwara no Sumitomo. Their tradition holds that in 994 he moved from Ōzu in Iyo to Ōmura in Hizen and took that place name as his family name.

Later scholarship instead identifies him with Taira no Naozumi. He is said to have invented the Sumitomo ancestry to erase his forebears' disgrace.