Jōō (貞応), also romanized as Jō-ō, was a Japanese era name (年号, nengō, lit. year name) after Jōkyū and before Gennin. This period spanned the years from April 1222 to November 1224. The reigning emperor was Go-Horikawa-tennō.
1222Jōō gannen (貞応元年): The era name was changed to Jōō (meaning "Righteous Answer") to mark an event or a number of events. The previous era ended and a new one commenced in Jōkyū, on the 13th day of the 4th month of 1222.
Events of the Jōō era
1222 (Jōō 2): Regulations established concerning salaries for Jitō