The Othan Empire was a small empire wedged between the Romulan Star Empire and the Klingon Empire. The Othans were at war with the Star Empire during the latter-half of the 24th century, which was covertly supported by the Klingon Empire.
Their vessels were slow and their weapons less powerful than their neighbors. They had yet to invent transporter or replicator technology and were considered to be technologically primitive when compared to the Romulans or Klingons. (Ship Recognition Manual, Volume 5: Starships of the Romulan Star Empire)