Keichō in the context of "Battle of Sekigahara"

The siege of Osaka (大坂の役, Ōsaka no Eki; or, more commonly, 大坂の陣 Ōsaka no Jin) was a series of battles undertaken by the Japanese Tokugawa shogunate against the Toyotomi clan, and ending in that clan's destruction. Divided into two stages, the winter campaign and the summer campaign, it lasted from 1614 to 1615. The siege put an end to the last major armed opposition to the establishment of the Tokugawa shogunate. The end of the conflict is sometimes called the Genna Armistice (元和偃武, Genna Enbu), because the era name was changed from Keichō to Genna immediately following the siege.

The Battle of Sekigahara (Shinjitai: 関ヶ原の戦い; Kyūjitai: 關ヶ原の戰い, Hepburn romanization: Sekigahara no Tatakai) was an important battle in Japan which occurred on October 21, 1600 (Keichō 5, 15th day of the 9th month) in what is now Gifu Prefecture, Japan, at the end of the Sengoku period.

This battle was fought by the forces of Tokugawa Ieyasu against a coalition loyal to the Toyotomi clan, led by Ishida Mitsunari on behalf of the young child Toyotomi Hideyori, from which several commanders defected before or during the battle, leading to a Tokugawa victory. The Battle of Sekigahara is often regarded as the most Important battle in Japanese history.

Bunroku (文禄) was a Japanese era name (年号, nengō; "year name") after Tenshō and before Keichō. This period spanned the years from December 1592 to October 1596. The reigning emperor was Go-Yōzei-tennō (後陽成天皇).

Genna (元和) was a Japanese era name (年号, nengō; "year name") coming after Keichō and before Kan'ei. This period spanned the years from July 1615 to February 1624. The reigning emperor was Go-Mizunoo-tennō (後水尾天皇). It is also known as Genwa.

The koban (小判) was a Japanese oval gold coin, cast on the order of Tokugawa Ieyasu in Edo period (Keichō era) feudal Japan and a part of Tokugawa coinage.