Changes

*Construction on the ''[[tenshu]]'' of [[Matsuyama castle (Iyo)]], begun in [[1820]], is completed.

*Construction on the ''[[tenshu]]'' of [[Matsuyama castle (Iyo)]], begun in [[1820]], is completed.

*Expeditionary forces of the [[Russia-America Company]] occupy [[Sakhalin Island]]; the action, and subsequent Russian claims to the island, are justified by [[Yevfimy Vasilyevich Putyatin]] based on the concepts of ''terra nullius'' and 'prior occupation.'

*Expeditionary forces of the [[Russia-America Company]] occupy [[Sakhalin Island]]; the action, and subsequent Russian claims to the island, are justified by [[Yevfimy Vasilyevich Putyatin]] based on the concepts of ''terra nullius'' and 'prior occupation.'

*The [[Kingdom of Ryukyu|Kingdom of Ryûkyû]] signs a treaty with the United States.

*The [[Kingdom of Ryukyu|Kingdom of Ryûkyû]] signs [[Treaty of Amity (Ryukyu-US)|a treaty]] with the United States.

*[[Sakamoto Ryoma|Sakamoto Ryôma]] completes training in Chiba and returns to [[Tosa han]].

*[[Sakamoto Ryoma|Sakamoto Ryôma]] completes training in Chiba and returns to [[Tosa han]].

===Births and Deaths===

===Births and Deaths===