Meireki

Overview

Meireki (明暦) was a Japanese era name (年号, nengō; "year name") of the Edo period, which ran from 1603 to 1868. The era began on 1655-05-18 and ended on 1658-08-20, when it was succeeded by the Manji era. It followed the Jōō era. The reigning emperor during Meireki was Go-Sai-tennō (後西院天皇).

The era name functioned as the official calendar marker for the shogunate and the imperial court. In practice, the Meireki years corresponded to the rule of the fourth Tokugawa shogun, Ietsuna, though the era name itself was proclaimed by the imperial court in Kyoto.

What Defined the Era

The Meireki era is most remembered for a single catastrophic event: the Great Fire of Meireki, which struck Edo in 1657. The fire began on the eighteenth day of the first month of the third year of Meireki and burned for two days. It destroyed roughly sixty percent of the city of Edo, including the shogun's castle, and is estimated to have killed tens of thousands of residents. The disaster reshaped urban planning in Edo, leading to wider streets and firebreaks that became standard in later rebuilding.

The era also saw the consolidation of the bakuhan system, the feudal structure of the Tokugawa shogunate. With Ietsuna still a child when he became shogun in 1651, regents and senior councillors managed state affairs. During Meireki, the shogunate tightened control over the daimyō, enforcing the alternate attendance system (sankin kōtai) that required lords to spend alternating years in Edo.

Key Events

• 1655-05-18: The Meireki era was proclaimed, replacing the Jōō era.
• 1657: The Great Fire of Meireki destroyed much of Edo. The fire started near the Hongō area and spread rapidly due to strong winds. The shogun's castle at Edo was badly damaged, and the disaster prompted a major reconstruction of the city.
• 1657–1658: In the aftermath of the fire, the shogunate ordered the construction of new fire-resistant storehouses and the widening of major roads. The rebuilding effort also included the development of the Fukagawa district as a new residential area.
• 1658-08-20: The Meireki era ended, and the Manji era began.

The Name in Japanese

The era name is written 明暦 in Japanese.

• Kana reading: めいれき
• Romaji: Meireki

The name breaks down into two kanji:

• 明 — read as mei in this word. Its core meaning is "bright" or "clear." The character combines the sun radical (日) with the moon radical (月), literally picturing light from both celestial bodies. In era names, 明 often carries the sense of "illumination" or "enlightenment."

• 暦 — read as reki in this word. Its meaning is "calendar" or "almanac." The character is composed of the tree radical (木) and the sun radical (日), reflecting the ancient practice of marking time by observing the sun's position relative to trees or wooden markers. In this context, 暦 signals the passage of years and the official reckoning of time.

Together, 明暦 suggests "bright calendar" or "clear reckoning of years." The choice of the name likely reflected a hope for a peaceful and well-ordered era, though the Great Fire of 1657 made the era anything but calm.

How the Era Name Works

A Japanese era name, or nengō (年号), is a system of dating that counts years from the start of a named era rather than from a fixed epoch. The practice began in China and was adopted in Japan in 645 CE under the Taika reform. Each era name is chosen by the imperial court and is meant to convey an auspicious meaning, often drawn from classical Chinese texts.

An era does not necessarily begin on January 1. The Meireki era started on 1655-05-18 and ended on 1658-08-20, with the new era proclaimed on the day the old one ended. Years within an era are counted ordinally: the first year of Meireki is 明暦元年 (Meireki gan'nen), the second year is 明暦二年, and so on. This means that a single Gregorian year can span two Japanese eras, and a single Japanese era year can span two Gregorian years.

The emperor traditionally proclaimed the era name, but during the Edo period the Tokugawa shogunate held effective power and influenced the selection. Era names were changed on several occasions—not only at the start of a new reign but also to mark auspicious events or to reset the calendar after disasters. The Meireki era itself was followed by the Manji era in 1658, a change that came just over a year after the Great Fire, reflecting the court's desire to turn the page on a calamitous period.

In modern Japan, the system continues under the 1979 law on era names, with each emperor's reign receiving a single era name. The Meireki era, however, belongs to the earlier pattern, when a single reign could see multiple era names and the calendar shifted with political and social circumstances.