History Dates of Eras

Ukigumo · 18 Sep 2025

I've learned that the Kamakura era was between 1185-1333 but this morning I saw it quoted as 1192-1333. I know Asuka era ranged from 538-710 but online it's 592-710! My sources suggest Azuchi-Momoyama as 1568-1603 but looking it up online it's quoted as 1568-1600.

Why am I constantly seeing different Japanese era dates? Is there no consensus upon them? Why?

thomas · 18 Sep 2025

This is a quote from our article on Kamakura-jidai:

While 1333 - the year in which the Kamakura shogunate was destroyed - is the undisputed end of the period, historians have suggested different dates for its beginning: either 1185, the year in which Minamoto Yoritomo 's brother Yoshitsune finally defeated the Taira in the sea battle of Dan-no-Ura, or 1192, when the imperial court officially recognised Yoritomo's military rule. Also in 1185, Yoritomo was granted permission to appoint jitō (地頭 , land stewards) and shugo (守護 , military governors), offices that became distinctive features of all shogunal governments. Therefore, scholars have a broader consensus on 1185 as the beginning of the shogunate's reign in Japan. The Kamakura and the Muromachi periods, from 1185 to 1568, are considered Japan's feudal or medieval period.

There is no historical consensus on which event is more momentous.

The same applies to the Azuchi-Momoyama Period: was it the Battle of Sekigahara that ushered in the new era, or Ieyasu's formal establishment of a new shogunate?

The Edo period (江戸時代), also known as the Tokugawa period, is traditionally dated from either the year 1600 when Tokugawa Ieyasu established national military dominance or from 1603 when he formally assumed the title of shōgun.

As with everything else in Japan, history is vague.

Ukigumo · 18 Sep 2025

thomas said:
There is no historical consensus on which event is more momentous.

Defeating the Taira or the appointing administrative staff? Heroism or administration? I think there's a clear winner!

thomas said:
The same applies to the Azuchi-Momoyama Period: was it the Battle of Sekigahara that ushered in the new era, or Ieyasu's formal establishment of a new shogunate?

The end of a battle is vague; when the last sword/stone/arrow is actuated or the last warrior falls or is the absolute establishment of the Shōgunate? Again, isn't it obvious?

thomas said:
As with everything else in Japan, history is vague.

I think some historians are just being contrary. They should follow my example…1185, 1603 etc

History Dates of Eras

Ukigumo

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thomas

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Ukigumo

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