The key periods of Japanese history covered in this site include:
(1) The Sengoku period (1467-1568); and
(2) The Azuchi-Momoyama period (1568-1603).
The date ranges for each period vary somewhat depending upon the event that is used as a point of reference to mark its beginning or end. This is further explained in the section for each period.
Key eras during the Sengoku and Azuchi-Momoyama periods are as set forth in the Index of Eras. The eras changed as a result of ascension to the throne by emperors, requests by sitting emperors, as well as conditions of war or revolt on the ground.
Note regarding Dates: All dates in this website are based on the original Japanese lunisolar calendar. For readability, the sections in English use the corresponding year. For example, Tenbun 7 is referred to as 1538. The days and months, however, correspond to the Japanese lunisolar calendar, which runs approximately one month behind the Julian calendar (which ran from 46 B.C. to 1582 A.D.) and the Gregorian calendar (a refined version of the Julian calendar) which is in current use worldwide. As a further example, 10/15 of 1558 means the fifteenth day of the tenth month of Tenbun 7.