The Taikō’s Death and Regency Power Crisis is the political rupture that turns a decade of peace into an increasingly imminent struggle over rule of the empire. The Taikō’s seven-year-old son, Yaemon, cannot yet inherit, so authority passes to five regents bound by public oaths to govern unanimously until the heir reaches fifteen. The system preserves the succession in law but leaves Japan’s most powerful daimyos competing over what that law can mean in practice.

Death and the Unfinished Succession

The Taikō had risen from peasant soldier to samurai, general, and finally the absolute Lord Protector of Japan. His rule subdued the land, rearranged fiefs, and compelled the daimyos to acknowledge his authority. The peace he established had lasted ten years, an extraordinary interval in a country where war had repeatedly broken into provincial and even village conflict. His death, a year before the events considered here, removes the person who had imposed that settlement without giving his young heir the power to sustain it.

The resulting danger is both dynastic and political. Yaemon is seven, while the regency agreement requires the five lords to rule in his name until his fifteenth birthday. The boy, like the country, is left between powerful adults. The Taikō can no longer protect his son, his line, or the empire; the institutions he left behind must do so instead. In Mura’s reflection, the contrast is stark: the maker of peace is gone, and war appears likely to return.

The crisis also unsettles the meaning of the Taikō’s achievement. Mura considers whether the order he imposed should simply perish with him, measuring human power against the permanence of mountains, sea, and stars. That thought does not lessen the political danger. It frames the succession not as a secure transfer but as a fragile human construction: a peace made by one ruler that may not survive his absence.

The Regency’s Rules and Rival Centers of Power

The council has five eminent daimyo members, but only Toranaga and Ishido possess substantial power. The Taikō had chosen the regents with their mutual hostility in mind, making agreement difficult. Their unanimous-rule oath was intended to keep the realm intact until Yaemon inherited; in practice, it also restricts any one regent’s ability to change the settlement by himself. The same arrangement that safeguards the heir therefore sharpens the contest between the two dominant lords.

The regents had publicly sworn eternal allegiance to the Taikō, his son, and the succession, and had taken sacred oaths to govern unanimously. Their promises make unilateral action a breach of the order they were appointed to preserve. Yet Yabu reasons that four regents may eventually unite against one through jealousy, fear, or ambition. In his expectation, the isolated lord would be defeated and his lands divided; the victors would then appoint a replacement fifth regent, and another four-against-one struggle could follow. The council’s formal stability thus contains a mechanism for recurring conflict rather than a guarantee of lasting peace.

The hostage question shows how readily political necessity can collide with those covenants. Ishido points out that the Taikō had forbidden regents to take hostages against one another, and argues that Lady Ochiba, the heir’s mother, is being held in Yedo as leverage for Toranaga’s safety in Osaka. Toranaga presents her stay as a family visit: her sister, Genjiko, is married to his heir, Sudara, and may soon give birth. Beneath that explanation lies the political force of kinship. Toranaga had arranged the marriage between Sudara and Genjiko rather than marry her himself, creating a bond to Ochiba’s beloved sister while keeping the marriage within his own family’s control. Family ties offer protection and influence, but the hostage dispute makes them instruments in the regency struggle as well.

Daimyo Choices and the Return of War

For lords outside the two dominant camps, the crisis is not an abstract dispute over constitutional principle. Mura fears his own lord, Yabu, whose rule weighs heavily on the villages and who takes more than their rightful share of the catch and crops. He sees the people caught between Toranaga and Ishido, with Yabu’s decision determining which side will claim their allegiance. His anxiety makes the scale of the regency struggle visible from below: decisions made by powerful lords threaten to divide provinces and communities into enemies again.

Yabu’s own calculations reveal the uncertainty at the center of the crisis. While in Yedo, he knows he and the other independent daimyos and their families are effectively safeguards for Toranaga’s return from Osaka, where the confrontation with Ishido is taking place. He has to consider the risks of leaving and the consequences of staying; his choice is shaped by rival power as much as by loyalty. The question is not simply which ruler has the better claim, but which lord is likely to survive the next rearrangement of alliances.

Toranaga later describes a plan that would make the conflict far larger than the limited council struggle Yabu expects. His proposed Crimson Sky operation would send eighty to one hundred thousand men toward Kyoto in a sudden campaign to seize the capital, free the Emperor from Ishido’s influence, and seek a new mandate for a council that puts the realm and heir ahead of private ambition. Toranaga acknowledges that the advance would leave his own lands, flanks, and retreat exposed. The plan shows how a dispute over regency authority can expand into a contest for control of the imperial center itself.

Military Change and the Crisis’s Consequences

Yabu’s response to the political uncertainty is also material. After taking possession of the foreign ship’s cargo, he discovers five hundred muskets, twenty cannon, thousands of cannonballs, and abundant ammunition. He orders the weapons moved secretly to his castle at Mishima. The discovery gives him a means to enlarge his power just as he weighs the coming war, and he imagines five hundred selected samurai trained to fight together alongside twelve thousand conventional troops, supported by specially trained artillerymen.

That ambition challenges a martial order in which guns have long been treated as a novelty and hand-to-hand combat as the honorable form of war. Japanese forces manufacture muskets, but bows have been considered more accurate, while the sword remains tied to a samurai code that prizes honorable combat and unquestioning loyalty. Yabu’s private answer to the question of whether firearms violate that code is to pursue the new strategy anyway. The succession crisis is therefore not only a struggle over who governs: it also creates conditions in which the means of governing and fighting may change.

A later demonstration makes the change concrete. Musketeers form five disciplined phalanxes, with three ranks forward and two in reserve, and fire successive volleys as the ranks kneel and reload. When defenders charge, the formation breaks and retreats before regrouping in a V and firing again. The exercise uses blank ammunition, and its apparent rout becomes a reversal: Jozen and his men see that, under real conditions, the two thousand defenders would have been slaughtered. The display does not itself settle the political crisis, but it demonstrates the new military capacity that the contest has brought into view.

The Taikō’s death thus leaves a peace without its maker and a succession order that depends on rivals keeping their oaths. Toranaga and Ishido’s practical dominance, the regents’ unanimity requirement, the use of family ties as leverage, and Yabu’s preparations all expose different pressures on that order. The looming war threatens to break the realm into competing provinces again, while the weapons and formations emerging from the crisis suggest that the conflict may not be fought according to the old rules.