Oichi was born in 1547 in
Nagoya Castle,
Owari Province, the fifth daughter of
Oda Nobuhide. She was the younger sister of Nobunaga and
Oinu. Her mother was an unnamed concubine who said to have also given birth to several of her siblings. Her other names include Ichihime (市姫), Odani no Kata (小谷の方), and Hideko (秀子). She was prized as a beauty of her time and was cherished by her older brother. She was intelligent and speculated to be slightly taller than most women of the age. Nobunaga once stated, "If Oichi was a man, she would make a fine warrior." Following Nobunaga's
conquest of Mino in 1567, Nobunaga arranged for Oichi, then twenty years old, to marry the rival warlord
Azai Nagamasa, in an effort to cement an alliance. Nobunaga was very grateful for the marriage and paid for the ceremony entirely (traditionally, the expenses were meant to be shared). Oichi bore Nagamasa one son (Manjumaru) and three daughters –
Yodo-dono,
Ohatsu and
Oeyo. The two clans prospered and worked well together until three years later. Seeing Nobunaga abuse the shogun's power, their relations grew sour and Nagamasa betrayed Nobunaga. . In the summer of 1570, Nagamasa betrayed his alliance with Nobunaga and went to war with him on behalf of the Asakura family in the
Battle of Anegawa. A story relates that Oichi sent her brother a sack of beans tied at both ends, ostensibly as a good-luck charm but in reality a warning that he was about to be attacked from both front and rear by the Asakura and Azai clans. According to the story, Nobunaga understood the message and retreated from his brother-in-law's assault in time. The fighting continued for three years until the Asakura and other anti-Oda forces were destroyed or weakened. Oichi remained with her husband at
Odani Castle throughout the conflict, even after
Toyotomi Hideyoshi, a trusted vassal and general of Nobunaga at the time, began laying siege to the castle. In the
Siege of Odani Castle, Nobunaga requested that his sister be returned to him before the final attack. Nagamasa agreed, sending out Oichi and her three daughters. Nagamasa had no hope of winning, and chose to commit
seppuku. Oichi and her daughters remained in the Oda family's care for the next decade. After Nobunaga was
assassinated in 1582, his sons and vassals broke into two major factions, led by two of Nobunaga's favored generals,
Shibata Katsuie and Hideyoshi. Nobunaga's third son, Nobutaka, belonged to the former group, and arranged for his aunt Oichi to marry Katsuie in order to ensure his loyalty to the Oda clan. But in 1583, Katsuie was defeated by Hideyoshi in the
Battle of Shizugatake, forcing him to retreat to his home at
Kitanosho Castle. As Hideyoshi's army lay siege to the castle, Katsuie implored Oichi to flee with her daughters and seek Hideyoshi's protection. Oichi refused, insisting on dying with her husband after their daughters were sent away. Her daughters were placed in the care of Hideyoshi; the oldest daughter, Yodo-dono (also known as Chacha), eventually became one of Hideyoshi's concubines and the mother of his heir apparent Hideyori. ==Oichi's daughters==