Watraii

The Watraii (Rihan: Watraiisu) were an offshoot of the Romulan species that were exiled from Remus in ancient times. They were known for wearing face-covering masks. 

History
In 2377 the Watraii emerged from their isolation to make war on the Romulan Star Empire. Ambassador Spock succeeded in ending this conflict after the Federation was caught up in it. 

In 2410 the Romulan Republic negotiated to form an alliance with the Watraii. Garaf, the heir of a Watraii duke, attempted to derail this by challenging an Lieutenant Commander Jaleh Khoroushi, operations officer of, to a duel, but her CO, Commander General Morgaiah t'Thavrau, substituted herself and severely wounded Garaf with her honor blade, forcing him to capitulate. The Watraii Parliament subsequently narrowly voted in favor of continuing negotiations.

Language
The Watraii language was a derivative of Rihan, but featured changes to certain phonemes.
 * kh'Rahon - Romulus (from Rihan "ch'Rihan")
 * Rahonshu - Romulans (from Rihan "Rihannsu")
 * Thesha - the planet (from Rihan "Thaes")