Around 700 BC, a wealthy man in southern Arabia donated three limestone altars to a temple dedicated to Ilmaqah, the moon god. Inscribed on each altar was a text identifying him as the grandson of Naw'um of the Nihm tribe. The three altars were unearthed in 1988 by German archaeologists amid the ruins of the Bar'an temple near Marib, in modern Yemen. They provide the earliest known reference to the Nihm, who today, nearly three millennia later, retain the name and are one of Yemen's largest tribes.
Aston, Warren P.
"A History of NaHoM,"
BYU Studies Quarterly: Vol. 51
, Article 6.
Available at: http://scholarsarchive.byu.edu/byusq/vol51/iss2/6