Strengthening of Tokugawa Sakoku (1650s)

Timeline

1. 1651Edo · JapanTokugawa Iemitsu died in 1651, and Ietsuna, aged only 10, succeeded as fourth shogun. The young shogun was assisted by senior councillors such as Sakai Tadakiyo; the shogunate continued the sakoku policy without major changes, carrying forward the institutions established by the previous generation.
2. 1651Sunpu · TōkaidōIn Keian 4 (1651), the military scholar Yui Shōsetsu (with accomplice Marubashi Chūya) plotted to overthrow the shogunate, but the conspiracy was suppressed after being leaked in advance. The incident prompted the shogunate to relax the ban on late-life adoption (matsugo yōshi) to reduce the social impact of large numbers of unemployed rōnin, while strengthening surveillance of dissident forces.
3. 1651–1660Dejima, Nagasaki · KyushuAfter the Dutch were relocated to Dejima in 1641, trade controls were fully normalized by the 1650s. The Dutch East India Company (VOC) factory chief had to travel to Edo annually for the sankin-kōtai-style Edo attendance, reporting European intelligence to the shogunate. The shogunate acquired Western knowledge through rangaku (Dutch learning) channels while strictly limiting the Dutch's freedom of movement, creating one-way information control.
4. 1652–1660All of Japan · JapanThe shogunate continued the previous generation's ban on Christianity, using the tera-uke (temple guarantee) system to force all subjects to register with a Buddhist temple, screening for hidden Catholics. An annual fumie ceremony required people to trample sacred images to prove they were not Christians. Hidden Christians (kakure kirishitan) continued their faith in secret in parts of Kyushu.