Suruga is less a physically described setting than a contested domain: its importance emerges through the promises made about it, the political documents naming it, and the routes armies might take through the surrounding territories. Its status is never simply settled. Toranaga describes Suruga as part of what Yabu will gain, Yabu later claims it as promised to him, and the prospect of moving through the region becomes part of the argument over how to wage war.

A Domain in the Regency Dispute

Suruga appears among the territories addressed by a formal appointment document concerning Ito Teruzumi. The document, carried by Jozen, bears the signatures of the other Regents and the authentication of Yodoko, the Taikō’s wife. It is one of six copies sent around the Empire, and this copy is designated for the lords of Iwari, Mikawa, Totomi, Suruga, Izu, and the Kwanto. Its distribution makes Suruga part of a larger political map: decisions made by the Council of Regents are being circulated to local rulers as claims to authority, not merely kept within Osaka Castle.

Jozen tells Yabu that the lords of Iwari, Mikawa, Suruga, and Totomi have already accepted the appointment, displaying their seals as evidence. Yabu is described as the next-to-last lord on Jozen’s list, with Toranaga still to be approached. The sequence places Suruga among territories whose rulers’ assent is being gathered, while also exposing the fragility of the process: the document’s authority depends on a Council that Toranaga argues is not legally functioning without all five members. Suruga therefore matters both as a domain in its own right and as one of the names through which rival parties seek to make political obedience visible.

Promised to Yabu

Toranaga uses Suruga as an inducement when explaining his resignation to Yabu. He tells him that the Council is hamstrung and that Yabu now has time to train his guns; he also declares that Yabu owns Suruga and Totomi. The promise is bound to a larger offer: Toranaga says that Yabu will eventually see Ikawa Jikkyu’s head and those of his kin displayed, then ride in state into new domains. The language presents territory as a reward for allegiance, but it is a forecast and political bargain, not evidence that Yabu has already secured undisputed possession.

That distinction becomes explicit when Yabu later bargains from a position of danger. He describes himself as overlord of Izu and says that Totomi and Suruga have been promised to him. The phrasing separates the authority he claims over Izu from the two territories he expects to receive. Suruga is thus one element in Yabu’s calculation of what loyalty to Toranaga might yield, and a claim he can invoke even while his immediate freedom of action is constrained.

Kasigi Omi presses the same alliance from another angle when Jozen’s document reaches Yabu. He argues that Toranaga is the better choice because he would give Yabu Ikawa Jikkyu’s province, while Ishido might give Izu to Jikkyu if he wins. Omi also points to Toranaga’s gift of his sword and his grant of control over the guns as signs that Yabu’s interests are already tied to Toranaga. Suruga belongs to this network of promised lands and military support: it helps make the alliance materially attractive, but the argument is about anticipated rewards and competing political futures, not a settled transfer recorded in the scene.

Strategic Routes and Changing Prospects

Suruga’s importance also lies in the possible movement of armies. After Yabu reports that Ikawa Jikkyu has died, he urges an immediate attack along the Tokaido Road. In his assessment, Izu is now safe, while Suruga and Totomi are vulnerable. The proposed advance would seize the road as far as Utsunoya Pass, secure bridges, cross the Tenryu River quickly, and keep communications open before driving toward Osaka. Hiro-matsu develops the military logic: if the route and its crossings could be secured, Toranaga’s forces could strike Ishido’s flank, contain Zataki in the mountains, reinforce the attack, and press onward.

This plan makes Suruga part of a connected strategic corridor rather than an isolated prize. Roads, passes, bridges, rivers, communications, and the neighboring domains determine whether a promised territory can be turned into practical advantage. Yabu’s confidence that Suruga and Totomi are vulnerable follows from Jikkyu’s death, but the proposed campaign still depends on securing the route and maintaining communications. The discussion presents opportunity as conditional: a change in the balance of power opens a possible advance, not an effortless or already completed conquest.

Political Geography and Uncertainty

The claims made over Suruga do not resolve into a simple account of ownership. The appointment document records that local lords have accepted Ito Teruzumi; Toranaga presents Suruga and Totomi as domains Yabu now owns; Yabu later calls them promised to him; and, after Jikkyu’s death, he describes them as exposed to attack. Each statement serves a different political or military purpose. Together they show how a domain can be treated at once as a unit of allegiance, a reward for service, and terrain to be captured or crossed.

The later settlement described for Omi reinforces the need to distinguish Suruga from neighboring grants. Toranaga appoints Omi head of the Kasigis and assigns him border lands in Izu, from Atami to Nimazu, including Mishima. The stated fief is Izu territory; it does not establish that Omi receives Suruga. Suruga’s narrative function remains bound to the larger contest: its uncertain allegiance and position along a contemplated route help translate the struggle between Toranaga and Ishido into control of domains, roads, and military access.