Cultural event
The oldest known examples of writing start appearing around this time.
It is around this time that several writing system start being used widely for dialects of Go-eo, the common language that the humans introduced to Gyerim spoke before their arrival. One of the oldest of these is the written system that will used for Min-eo. 137 years after the arrival of humans is roughly the year that the oldest known sample survives from. However it is actually quite developed, suggesting that this writing system was in development for a while prior to this.