also: しょうほ
noun
Shōhō era (1644–1648)
Japanese era name spanning from December 16, 1644 to February 15, 1648 in the Gregorian calendar.
正保年間に起きた事件を調べている。
I am researching an incident that occurred during the Shōhō era.
The era name 正保 was adopted in 1644. The exact derivation is uncertain; it is conventionally associated with the kanji 正 (correct, righteous) and 保 (protect, maintain).