Jōji

Overview

Jōji (貞治) was a Japanese era name of the Northern Court during the Era of Northern and Southern Courts. The era followed Kōan and preceded Ōan, spanning from September 1362 through February 1368. The emperor in Kyoto during this period was Emperor Go-Kōgon (後光厳天皇, Go-Kōgon-tennō). His Southern Court rival, based in Yoshino, was Emperor Go-Murakami (後村上天皇, Go-Murakami-tennō).

The Jōji era belongs to the Muromachi period (1336–1573), a time when the Ashikaga shogunate ruled from Kyoto while the imperial court was split between two competing lines. The Northern Court held the capital and the shogun's backing; the Southern Court claimed legitimacy from the original imperial regalia and held out in the mountains south of Nara.

What Defined the Era

The defining feature of the Jōji era was the ongoing split between the two imperial courts. This division, known as the Nanboku-chō (南北朝, literally "southern and northern courts"), had begun in 1336 and would not be resolved until 1392. During Jōji, the Northern Court operated under the authority of the Ashikaga shogunate, which controlled the military and administrative machinery of the state.

The era also saw the consolidation of Ashikaga power under the second shogun, Ashikaga Yoshiakira. Yoshiakira had succeeded his father, Ashikaga Takauji, in 1358, and the Jōji years were a period of stabilising shogunal authority after the turbulence of the early Nanboku-chō wars. The Southern Court, though weakened, continued to press its claims, and skirmishes and diplomatic manoeuvres between the two courts remained a constant backdrop.

Key Events

In September 1362, the era name was changed from Kōan to Jōji, marking the formal start of the new period. The change came as part of the standard practice of renaming eras to mark a new imperial reign or to signal a fresh start in the face of calamities or auspicious signs.

During the Jōji years, the Southern Court lost significant ground. Emperor Go-Murakami, who had led the Southern cause since 1339, died in 1368, near the very end of the era. His death came just before the era name changed to Ōan in February 1368, and it marked a turning point in the long conflict, as the Southern Court's position grew increasingly precarious under his successors.

The era also witnessed continued military campaigns between the two courts, though the Northern Court and the shogunate held the upper hand. The Ashikaga shogunate worked to secure its control over the provinces, appointing loyal constables and rewarding allies with land grants, all while the Southern Court's support base eroded.

The Name in Japanese

The era name Jōji is written with two kanji: 貞治.

The kana reading is じょうじ, and the romaji is Jōji.

The first character is 貞, read here as jō. Its core meaning is "upright," "chaste," or "steadfast." In classical Chinese and Japanese usage, 貞 carries a moral weight—it describes a person or a ruler who is constant, correct, and true to principle. It appears in compounds like 貞節 (teisetsu, chastity or fidelity) and 貞操 (teisō, chastity or honour).

The second character is 治, read here as ji. Its meaning is "to govern," "to rule," or "to bring order." This is the same character used in 政治 (seiji, politics or government) and 治安 (chian, public order). In era names, 治 is a frequent choice because it expresses the hope that the new period will be one of good governance and peace.

Taken together, 貞治 conveys the sense of "upright governance" or "steadfast rule." The name was chosen to project an ideal of moral, orderly administration—a fitting aspiration for a Northern Court that claimed to be the legitimate heir to the imperial throne while its rival sat in Yoshino.

How the Era Name Works

A Japanese era name, or nengō (年号, literally "year name"), is a system of dating that counts years from the start of a named period rather than from a fixed epoch. The system was imported from China and adopted in Japan in 645, during the Taika reforms. Each era name is composed of two kanji, chosen for their auspicious meanings, and the era begins on a specific date, often the first day of a new year but sometimes mid-year, as with Jōji.

Era names serve several functions. They mark the reign of an emperor, though they can change multiple times within a single reign. They also signal political messages: a new era might be proclaimed to celebrate a victory, to mourn a death, to ward off bad omens, or to express hope for renewal. The selection of characters was a serious court ritual, with scholars proposing candidates and the emperor or shogun making the final choice.

During the Era of Northern and Southern Courts, the system became complicated. Both courts issued their own era names, so the same calendar year could have two different names depending on which court's authority one recognised. Jōji was the Northern Court's name; the Southern Court used its own era names during the same span of years. This dual system lasted until 1392, when the courts were reunited and a single era name was restored.

The nengō system continued in use until 1868, when the Meiji government adopted the iseki system, in which each emperor's reign has a single era name. That practice continues today, with the current era, Reiwa, having begun in 2019. For students of Japanese, era names remain essential for reading historical documents, understanding dates in literature, and navigating the cultural references that still use them.