Japan’s restrictions on foreign movement

Japan’s restrictions on foreign movement are a system of controlled access that turns ports, travel permits, and pilotage into instruments of political power. Foreign seamen and traders cannot move freely through the country: their lawful routes are narrow, their ships can be seized beyond designated ports, and even Japanese ocean-going vessels are tied by law to Portuguese pilots. The rules do not simply separate Japan from foreign visitors; they regulate who may travel, where, and under whose authority, while leaving room for powerful lords to grant exceptions and assert control.

Scope and Legal Boundaries

Vasco Rodrigues explains that Japan is officially forbidden to foreigners except at Nagasaki and Hirado. The restriction is not applied identically to every foreign group. Portuguese priests, he says, disregard the prohibitions and go where they please, while seamen and traders cannot do so without a special pass from the Regents or authorization from a great daimyo such as Toranaga. The distinction places maritime visitors under tighter practical controls than the missionaries, whose mobility Rodrigues describes as tolerated despite official orders.

Permission to travel does not guarantee security for a ship. Rodrigues identifies a further rule: outside Nagasaki or Hirado, any daimyo may seize a foreign vessel. Toranaga has already taken Blackthorne’s ship, the Erasmus, and Rodrigues cites that seizure as an example of the law in operation. Foreign movement is therefore vulnerable not only to central restrictions but also to a regional lord’s power to intercept and appropriate a vessel. The legal framework makes access conditional and exposes ships beyond the permitted ports to direct political control.

The Taikō’s Restrictions and Their Context

Rodrigues attributes the prohibitions to the Taikō, saying that foreigners and priests once moved more freely after the Portuguese first arrived in 1542. In his account, restrictions began after the Taikō consolidated power. He recalls that the Taikō issued edicts against Christian priests and those seeking to spread their faith, and ordered priests gathered at Nagasaki for removal to Macao under threat of death if they returned. Rodrigues also says that the Taikō then left them alone and did not fully enforce the expulsion orders, after which most priests remained in Kyushu, where they were welcome.

Rodrigues’s explanation is a sailor’s account, not a neutral legal history. He relays the priests’ belief that Buddhist opponents turned the Taikō against them, and characterizes later measures as arbitrary: he says that the Taikō banished two or three Christian daimyo, martyred twenty-six priests at Nagasaki three years before his death, and then took no further action. These claims show how foreign residents interpret the restrictions through the conflict over Christianity, but also how inconsistent enforcement could coexist with severe formal penalties. The rules’ force lies partly in the uncertainty of whether a prohibition will be ignored, selectively used, or violently enforced.

Pilotage, Routes, and Maritime Control

Restrictions on movement operate alongside a dependence on controlled maritime knowledge. Rodrigues says the Taikō required the few Japanese ocean-going ships to carry Portuguese pilots, and that the requirement remains law. He portrays Japanese sailors as skilled coastal fighters and navigators but says they fear deep water. The explanation is Rodrigues’s, but the rule itself makes foreign expertise part of Japanese ocean travel: access to the sea is regulated not only by permits and ports but by who is legally required to guide a ship beyond familiar coasts.

The voyage carrying Toranaga to Anjiro shows how this dependence affects a specific route. The galley first travels south along the east coast of the Izu Peninsula, using its large midships sail. At Cape Ito, Rodrigues turns west-southwest and leaves the coast for a landfall at Cape Shinto, about two hundred miles away. He chooses the open-sea passage because following the coast would cost too much time, and because Toranaga has ordered him to pilot the galley quickly. The route makes the sea a corridor of political movement, but one whose use depends on a Portuguese pilot’s judgment and the daimyo’s commission.

That expertise matters because navigation remains uncertain. Blackthorne reflects that existing charts are too vague to be useful and that longitude cannot be fixed. A rutter, by contrast, records courses between ports and capes, soundings, water color and seabed, winds, currents, storms, fair-weather patterns, watering places, havens, reefs, and hazards. Such knowledge can make a passage safer, but it is not infallible: copied or translated rutters may contain errors, even deliberate ones, and a pilot cannot be certain until he has sailed a route himself. In this setting, limiting movement and guarding navigational knowledge reinforce one another: a permit may authorize a journey, but reliable passage still depends on scarce information and experienced pilots.

Ships in Hostile Waters

The risks of foreign movement become visible when Toranaga’s galley approaches the Portuguese frigate Santa Theresa. Blackthorne sees the frigate move away from its berth once its escort of Gray samurai has hurried off, then anchor offshore in deep water. He recognizes the maneuver as a standard precaution for European ships in a hostile or unfamiliar harbor. The crew prepares its cannon, muskets, grape, cannonballs, chainshot, and cutlasses; armed men take positions aloft, and the ship’s two thirty-pound stern chasers face the approaching galley.

The encounter shows that regulated access does not eliminate foreign power at sea. The frigate’s crew can ready its weapons and choose a defensible position; the galley, meanwhile, can maneuver freely under oar power where the frigate must tack to enter the harbor mouth. As the vessels approach the cliffs, Blackthorne judges the narrow sea room and orders the galley to hold its course, aware that the faster frigate is closing on a collision path. Ports, pilots, permits, and armed ships thus form parts of the same system: Japan’s rules shape where foreign vessels may go, while control of wind, route, and maneuver determines what happens when they meet beyond the shore.