Theta Cobrini (known as the Mav'renas system by Romulans) was a star system located in the Beta Quadrant near the Avastam and had 5 planets.

In the year 2267, the Federation constructed an outpost on Theta Cobrini V that would be capable of scanning deep into Romulan space. Later that year, the outpost was destroyed by Klingon vessels that then attacked a Romulan force which had also been sent to destroy the base. (ST novella: The First Peer)

The stellar notation using the Greek language letter "theta" indicates that there might be a star group or constellation of some sort named "Cobrini", of which Theta Cobrini would logically be indicated to be the eighth most prominent system.

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