Shesa was a Bajoran who was Kai of Bajor during the time Opaka Sulan was a Prylar.

In 2376, seeing how nervous people were around her, Opaka remembered she felt a similar nervousness when she was with Kai Shesa. (DS9 novel: Unity)

Given the timeline of the Kais introduced in the Star Trek: Terok Nor series, Shesa may have been the Kai prior to Meressa, or the Kai between Meressa and Arin.

Kais of the Bajoran faith
	Dava Nikende • Taluno • Shesa • Meressa • Arin • Opaka Sulan • Winn Adami • Pralon