Shōhō (正保) was a Japanese era name (年号,, nengō,; lit. "year name") after Kan'ei and before Keian. This period started in December 1644 and ended in February 1648. During this time, the emperor was Go-Kōmyō-tennō (後光明天皇).
Events of the Shōhō era
Nagaoka Castle in Echigo Province, circa 1644 (Shōhō 1)
1644 (Shōhō 1): The third major map of Japan was ordered by the shogunate.
18 May 1645 (Shōhō 2, 23rd day of the 4th month): The Shogun was elevated the court role of Dainagon.
♯The Northern pretenders did not recognize the Genkō era. Gentoku was used in the Northern Court until 1332. ₪The Shōkyō era was recognized only by the Northern pretenders, not by the Southern Court. ‡ Upon reunification of the Northern and Southern Courts in 1392, Genchū was discontinued. Meitoku was used until 1394.