Shimazu Nariakira was born at the Satsuma domain's estate in
Edo, on April 28, 1809. From his mother, he was descendant of
Date Masamune,
Tokugawa Ieyasu and
Oda Nobunaga. He rose to power as
daimyō of the domain of Satsuma only after surviving a gruesome and arduous war within his own family and domain, known as the
Oyura Sōdō or the
Takasaki Kuzure. He faced much opposition in Satsuma since he spent most of his life in Edo (a compulsory requirement as the heir of a daimyo, set by the Shogunate); as such he was considered a stranger in his own domain. In his quest to prepare Satsuma for potential Western aggression, he also faced many opposing military schools of thought in Satsuma who disagreed with the Shimazu family's plan for strengthening coastal defense. , a close relative of Shimazu Nariakira. Nariakira did not see eye to eye with his father,
Shimazu Narioki, or his father's chief advisor,
Zusho Hirosato. Both Narioki and Zusho were wary of the
Tokugawa shogunate. Zusho also saw many similarities in Nariakira and his grandfather,
Shigehide. Shigehide also had a great interest in Dutch studies as well as scientific and industrial projects, which promptly led to the deterioration of the domain's financial position. Having worked so hard to rehabilitate and strengthen the treasury of Satsuma, Zusho did not encourage Nariakira's ambitious and costly program for a military build-up. Another formidable and dangerous obstacle for Nariakira in not only his plans to bolster the defenses of all of Japan but also his ascendancy to
daimyō of Satsuma was Yura, the mother of his half-brother,
Hisamitsu. By the time Nariakira had arrived in Satsuma to address a crisis related to the
Ryūkyū Kingdom (a vassal state under Satsuma) in 1846, Yura had used her charm to thoroughly convince Narioki to promote the interests of her son Hisamitsu over Narioki's legitimate son and heir-apparent (Nariakira). Zusho, Narioki, Yura, and Hisamitsu were the key members of the coalition which rallied other Satsuma bureaucrats who felt threatened by Nariakira's immense and highly intimidating intelligence, and tried to impede all attempts Nariakira made to retire his father as
daimyō and take his place. Nariakira arrived in Satsuma to attempt to resolve the Ryūkyū crisis, as per the orders of shogunal high official
Abe Masahiro, on June 25, 1846. A French ship had arrived in Ryūkyū in 1844, and two British ships the following year, demanding treaties of amity and commerce; as the kingdom was semi-independent and not generally regarded to be part of Japan proper, this presented a dilemma. Nariakira and Abe Masahiro decided in the end that, despite the shogunate's policies of
seclusion, such relations should be allowed in Ryūkyū, rather than risking violent conflict with the Western powers. On March 8, 1847, Narioki arrived in Satsuma, making Nariakira's position, something equivalent to deputy to his father, obsolete. The conflict had gotten so far out of hand that Nariakira was left with no choice but to request aid from Abe Masahiro. Abe, seeing that Nariakira was being hindered in his proceeding with the Ryūkyū crisis by his own father and family retainers, aided in getting Narioki to retire and removing Zusho. Abe first went about the task of removing Zusho, who was greatly relied upon by Narioki, by inviting him to Edo. Abe's stated purpose was a desire to discuss the Ryūkyū crisis and its current handling. In the process of the conversation, Abe began to ask Zusho a line of questioning that made it apparently clear to Zusho that Abe, as well as the Tokugawa shōgun, knew the truth of the illegal Satsuma-Ryūkyū-Western trade relations, which were being carried out against the shogunate's policy of seclusion. Zusho's devotion to Narioki pushed him to take full responsibility for the illicit trade by committing
seppuku on December 18, 1848. On December 3, 1850, Narioki was called to Edo by the shōgun and presented with a prized set of tea utensils, indicating the shōgun's desire for Narioki to retire. On February 3, 1851, Nairoki retired and Shimazu Nariakira was made
daimyō of Satsuma. ==Love of education and Western culture==