Meiō

Overview

Meiō (明応) was a Japanese era name (年号, nengō; "year name") that followed Entoku and preceded Bunki. The era spanned from July 1492 through February 1501, during the Muromachi period (1336–1573). Two emperors reigned during this time: Go-Tsuchimikado-tennō (後土御門天皇) and Go-Kashiwabara-tennō (後柏原天皇).

The era name is also romanised as Mei-ō, with a hyphen marking the long vowel. In Japanese historical chronology, Meiō belongs to the late Muromachi period, a time when the Ashikaga shogunate's authority was eroding and regional warlords were consolidating power.

What Defined the Era

The Meiō era opened in 1492, a moment when the Ōnin War (1467–1477) had already devastated Kyoto and shattered the old order of shogunal control. The decade that followed was defined by the aftershocks of that conflict: the shogunate remained nominally in place, but real power had shifted to provincial military governors and emerging warlords.

The era is most closely associated with the Meiō Incident (明応の政変, Meiō no seiben) of 1493, a coup that removed the sitting shōgun, Ashikaga Yoshitane, and replaced him with Ashikaga Yoshizumi. The coup was orchestrated by Hosokawa Masamoto, a powerful deputy shogun, who acted without imperial sanction. This event demonstrated how thoroughly the shogunate's authority had decayed; the era name itself became shorthand for political instability and the triumph of military force over established hierarchy.

The era also saw the death of Go-Tsuchimikado-tennō in 1500, after a reign of over three decades. His successor, Go-Kashiwabara-tennō, faced severe financial constraints; the imperial court was so impoverished that the new emperor's formal enthronement ceremony was delayed for years, a stark illustration of the court's diminished resources during the era.

Key Events

• 1492 (Meiō 1): The era began in July, replacing Entoku. Ashikaga Yoshitane held the position of shōgun at the start of the era.
• 1493 (Meiō 2): The Meiō Incident. Hosokawa Masamoto forced Shōgun Ashikaga Yoshitane from power and installed Ashikaga Yoshizumi in his place. Yoshitane fled Kyoto and later returned to the capital only after Yoshizumi's death in 1511.
• 1500 (Meiō 9): Emperor Go-Tsuchimikado died on October 21. Crown Prince Katsuhito ascended the throne as Go-Kashiwabara-tennō, but the formal enthronement ceremony was postponed until 1521 because the court lacked the funds to pay for it.
• 1501 (Meiō 10): The era ended in February, when the new era name Bunki was proclaimed.

The Name in Japanese

The era name is written 明応 in kanji. Its kana reading is めいおう, and its romaji is Meiō.

The name consists of two characters:

• 明 — read as mei in this word. The character means "bright," "clear," or "illuminating." It is the same character used in words like 明るい (akarui, "bright") and 明日 (ashita or myōnichi, "tomorrow"). In era names, 明 carries connotations of clarity, enlightenment, and radiant virtue.

• 応 — read as ō in this word, with the long vowel indicated by the macron. The character means "to respond," "to answer," or "to correspond." It appears in compounds like 応答 (ōtō, "reply") and 反応 (hannō, "reaction"). In the context of an era name, 応 suggests a fitting response or a proper correspondence to circumstances.

Together, 明応 can be understood as "bright response" or "clear answer." The name was chosen to signal that the era would be one in which heaven's light would meet with a proper, virtuous reply from the ruler. The combination of a luminous character with a responsive one was typical of Muromachi-era naming practice, which favoured auspicious, morally charged pairings drawn from classical Chinese texts.

Note the pronunciation shift: the second character, 応, is normally read as ō only in certain compounds; on its own it is read kotae or kotaeru in native Japanese contexts. In the era name, the on-yomi (Chinese-derived reading) ō is used, and the preceding mei lengthens into meiō when spoken aloud.

How the Era Name Works

A Japanese era name, or nengō (年号), is a system of dating by imperial reign periods rather than by consecutive years from a fixed epoch. Each era name is proclaimed by the emperor, and the era begins on a specific date, often at the start of a new year or to mark a significant event such as an accession or a natural disaster believed to require a fresh start.

The nengō system was introduced from China in 645 CE, during the Taika era, and remained in continuous use until the Meiji period. Since 1868, Japan has used a single era name per emperor, but before that, era names could change multiple times within a single reign. The Meiō era, for instance, fell entirely within the reign of Go-Tsuchimikado-tennō and then continued into the first months of Go-Kashiwabara-tennō's reign.

Era names are chosen for their auspicious meaning, typically drawn from classical Chinese literature. The selection process involved court scholars who proposed candidate names, which were then reviewed and approved by the emperor. The names were intended to express a hope for the coming years: peace, prosperity, virtue, or a corrective to recent misfortunes.

In practice, the era name also served as a practical calendar. Documents, legal records, and historical chronicles dated events by the era year, such as "Meiō 2" for 1493. This system remained the official method of dating in Japan until 1873, when the Gregorian calendar was adopted, and it continues today in the form of the current imperial era.