What is "kakei"

Kakei (嘉慶) was a Japanese era name (年号, nengō, lit. year name) of the Northern Court during the Era of Northern and Southern Courts after Shitoku and before Kōō. This period spanned the years from August 1387 to February 1389. The emperor in Kyoto was The Southern Court rival in Yoshino during this time-frame was .