Heiwa Period

"But that all changed when you exterminated the Quincy. You had won for yourselves a world of peace. You found things that you desired to protect, to treasure, and in doing so, you became a group of weaklings, ready to hesitate in the name of your meaningless justice or pride."

- Yhwach, describing the Gotei 13, after their victory in the Quincy Blood War.

The Heiwa Period (平和時代, Heiwa Jidai; literally "era of peace") was a period in the history of Soul Society, following the Warring Souls Period, in which the King of Souls delegated authority to the Central 46 and the Gotei 13, under the command of Genryūsai Shigekuni Yamamoto, became the sole military power after the extermination of the Quincy.

Behind the Scenes
The name for this era is inspired by the Heian Period (平安時代, Heian Jidai), despite the fact that this era would more strongly reflect that of the Tokugawa Shogunate's rise to power and the tranquility that followed the bloodshed of the previous period of warring states.