Portal:Japan/Anniversaries/June/June 23

743 - 三世一身の法を廃止し、「墾田永年私財法」が制定される。
1281 - 元の大軍が再び来襲する（弘安４年の弘安の役）。
1698 - 松尾芭蕉が「奥の細道」の旅に出発。※旧暦では3月27日
1944 - A new volcano erupts near Lake Tōya in Hokkaido. The volcano is later named Shōwashinzan.
1945 - The Battle of Okinawa ends.
1947 - The first post-war Diet session opens.
1948 - The president of Shōwa Denkō is arrested in Japan's first post-war bribery scandal.
1960 - The Treaty of Mutual Cooperation and Security between the United States and Japan becomes effective. To head off demonstrations, the ceremony for the exchange of the ratified treaties in Tokyo was not announced until one hour before it actually took place.
1961 - The United States, the Soviet Union and Japan are among twelve countries who sign the Antarctic Treaty.
1982 - Shinkansen service begins between Ōmiya and Morioka.