The Azai clan was a line of
daimyōs (feudal military lords) seated at
Odani Castle in northeastern
Ōmi Province, located within present day
Nagahama,
Shiga Prefecture. The Azai originated in the early 1500s and claimed descent from the
Hokke branch of the
Fujiwara, a powerful clan in Japan from the
Heian period to the
Kamakura period. Initially, the clan were
vassals of the
Kyōgoku, but gradually emerged as independent
daimyōs in northern Ōmi. However, Azai domains were soon conquered by the
Rokkaku and the clan was forced into becoming their vassals.
Azai Nagamasa became head of the clan in 1560 and successfully fought against the Rokkaku for independence by 1564. The Azai were long-time allies with the
Asakura clan of
Echizen Province who had assisted the clan in securing their independence. In 1570, Nagamasa joined the Asakura in their opposition to lord
Oda Nobunaga, his brother-in-law and ally, to honour their alliance. The Azai were defeated by Nobunaga at the
Battle of Anegawa in 1570, and all but eliminated when Nobunaga
conquered Odani Castle and Nagamasa committed
seppuku (honorable suicide) in 1573. ==Order of succession==