The clan built and controlled Kasugayama Castle and the
surrounding fief, in what is now Niigata Prefecture. Nagao
Kagetora, adopted by Uesugi Norimasa, became lord of the castle
in 1548, taking the name Uesugi Kenshin and effectively changing
the ruling clan of Kasugayama from Nagao to Uesugi. Those
members of his family who retained the Nagao name became
retainers to the Uesugi family.  Nagao Family Members of Note -
Nagao Tamekage (d. 1536), was the father of Nagao Kagetora, who
would become Uesugi Kenshin. - Uesugi Kenshin (1530-1578),
originally Nagao Kagetora, is one of the most famous warlords in
Japanese history. - Nagao Fujikage (dates unknown) fought under
Kenshin at the fourth battle of Kawanakajima in 1561.  Further
reading - Frederic, Louis (2002). "Japan Encyclopedia."
Cambridge, Massachusetts: Harvard University Press. - Turnbull,
Stephen (1998). 'The Samurai Sourcebook'. London: Cassell & Co.