Memory Beta, non-canon Star Trek Wiki
Memory Beta, non-canon Star Trek Wiki

The Yemai Empire was the dominant political entity on the planet Sigma Niobe II during the mid 23rd century. The empire was ruled by the Niobean civilization known as the Yemai, and maintained and exercised its power largely through the use of a steam-powered fleet. (TOS - Constellations short story: "As Others See Us")