Thieurrull (translated from Rihannsu as "Hellguard" and also known as 872 Trianguli V) was a planet located in the space of the galaxy's Beta Quadrants, the fifth planet in orbit of the 872 Trianguli star system. Thieurrull was once a Romulan world, a failed colony planet located in the Romulan Neutral Zone. Hellguard was hastily and incompletely evacuated after the "Second Federation Encroachment", and was the birthplace of Saavik. (TOS novel: The Pandora Principle; TOS - Rihannsu novel: The Romulan Way; ST novel: Vulcan's Heart)

In an alternate timeline with similar events, Saavik and a group of other children lived a feral existence on this planet before their discovery by Sarek. (ST - Myriad Universes novel: The Chimes at Midnight)

ConnectionsEdit

planets visited by the USS Enterprise (NCC-1701) (2273-2285)
Admiral Kirk's command (from 2273)	Earth • Nelestra • Zaran II • Levaeri V • Starbase 16 planet • Andrea IV • Agena IV • Mycena• Starbase 8 planet • Barak VII • Andronicus • Starbase 28 planet • Phaeton • Hephaestus • Zeta Reticuli II • Starbase 9 planet • Lieberman's World • Miaplacidus V • Valerian • Goran IV • Zenna IV • planet of telekinetic herds • Starbase 11 planet • Parides IV • Khepri • Pollox IV • Upsilon Xi III • Belle Terre • Lycos V
Spock's command (until 2285)	Earth • Thieurrull • Starbase 12 • Regula	Admiral Kirk's command (2285)	Earth • Genesis Planet • Organia • Beta Epsilon VI • Babel • Vulcan • Romulan planetoid