There 's a moniker for Kyoto that all sorcerers are aware of:

The Capital of Jujutsu.

This title finds its roots in the history of the land itself. Kyoto was originally named Heian-kyo, and the city was established in the year 794 to serve as the new seat of power for Emperor Kanmu 's imperial court. Thus marked the beginning of the Heian period, an era that eventually came to be regarded as the 'Golden Age of Jujutsu. ' Many powerful sorcerers had freely walked the lands during those times, and it was then that many advancements in the art of sorcery had been accomplished as well.

Ashiya Sadatsuna and his creation of the Simple Domain, for example. This particular technique was originally meant to be strictly kept to Ashiya 's school of thought and his disciples. Outsiders were

forbidden

from learning their arts 'but time eroded their barriers and restrictions against countless interested parties who coveted their secrets.