Continuity/Sho History

Kou and Kou-an
Kou was only 15 when he rose to power in Ryujii, but he new he was destined to unite his people. And in 1046 RC, Emperor Kouhad done just that. Iiwah he took by force, invading with a massive fleet; Chiran-Tou he took by peace, marrying the daughter of its ruler and moving his throne there. Some time later, Empress Kou-an, great granddaughter of the Emperor Kou, ascended to the Throne of the Sho Empire at 15, like Kou.

We have a few crucial bits of information here that can help us approximate when Kou-an ruled: Kou's age, the date Kou united Sho, and Kou-an's age when she took the throne.

The following three tables assume that Kou was 15 years old when he united the Sho people, and fill in the generations between Kou and Kou-an assuming gaps of 15, 30, and 45 years:

Short generational gap (children at 15)

Medium generational gap (children at 30)

Long generational gap (children at 45)

It seems a bit implausible that Kou ascended to the throne of Ryujii at 15, and within the same year took Iiwah by force, and Chiran by marriage. A more reasonable length of time would be that, while he became ruler of Ryujii at 15, he did not unit all of Sho until he was 30. The following three tables keep that in mind, and again assume generation gaps of 15, 30, and 45 years: Short generational gap (children at 15)

Medium generational gap (children at 30)

Long generational gap (children at 45)

So, the date ranges we have for when Kou-an possibly ascended to the throne are:
 * 1,076 - 1,079 RC (Kou is 30 when Sho is united, 15 year generational gap)
 * 1,091 - 1,094 RC (Kou is 15 when Sho is united, 15 year generational gap)
 * 1,121 - 1,124 RC (Kou is 30 when Sho is united, 30 year generational gap)
 * 1,136 - 1,139 RC (Kou is 15 when Sho is united, 30 year generational gap)
 * 1,166 - 1,169 RC (Kou is 30 when Sho is united, 45 year generational gap)
 * 1,181 - 1,184 RC (Kou is 15 when Sho is united, 45 year generational gap)

This gives us a possible range of 1,076 - 1,184 RC, which is quite a range. That being said, the range of 1,121 - 1,124 RC is the most plausible, since it was unlikely Kou accomplished all he did at 15, and 30 years is an average human generational gap. We could give this a little bit of padding, to account for some shorter or longer generations, and conclude that the probable date range for Kou-an's ascension to be around 1,115 to 1,130 RC.