Mnean na Tal Shiar. 'Rau hrtae efvi temiorrha 'u dynt olhna. Tlaru na mnei ilmnae'edh. 'Rau Fvakh'laru nnea K'manatran ihir dien icupae'edh. -Adjutant Director
We are Tal Shiar, let people fear us and greatly respected. Intelligence is our convictions. Let misinformation of other race be their downfall.
Litteral Translation: Let other race fear the romulan race and greatly respected. Information is our contribution. Let bad information of other race be their failure.
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MISSION: Effective & Efficient Playability
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Ancient Origins: Commander Spock once theorized that Sargon's people may have colonized Vulcan some 600,000 years ago. Sargon believed that Humans and Vulcans (and therefore also Romulans) might even be descendants of their early travelers. (TOS: "Return to Tomorrow")
With the discovery of ancient humanoid progenitors in the 24th century, most humanoid lifeforms in the known galaxy were found to have a "seed" genetic code guiding their evolution to the humanoid form. (TNG: "The Chase")
Modern Origins: When Surak's reforms of embracing logical principles and rejecting emotions spread rapidly across Vulcan in the 4th century, a minority rejected Surak's ideals. Those who marched beneath the banner of the raptor, which became the symbol of the Romulan Star Empire, departed Vulcan in the 4th century. Later, some of their descendants established settlements on the planets Calder II, Dessica II, Draken IV, Yadalla Prime, and Barradas III. An ancient offshoot civilization, called the Debrune, at one time existed on Barradas III, but it had died out by the 24th century. (ENT: "Kir'Shara"; TNG: "Gambit, Part I")
At some point, another group settled on twin planets that became known as Romulus and Remus. While Romulus was a Class M planet, Remus was a harsh planet notable only for its dilithium deposits. Once settled, the two worlds became the foundation of an interstellar empire that expanded to many worlds, reaching across some of the Alpha Quadrant. Eventually that power came to be known as the Romulan Star Empire. (TNG: "Gambit, Part I", "Gambit, Part II"; Star Trek Nemesis)
In 2387, a star close to Romulus went supernova. Ambassador Spock attempted to prevent the supernova from striking the planet using red matter, but he was unsuccessful and Romulus was destroyed. A mining vessel, the Narada, survived and was captained by Nero, who exploited the black hole's creation of a time warp into the past to attack Spock's home planet of Vulcan in revenge and planned to destroy all planets of the Federation so that Romulus could be "free" and possibly conquer everywhere else. The first part of Nero's plan was mostly successful as Vulcan and most of the Vulcan species was destroyed. However, the Narada and its crew were destroyed in the Battle of Earth by the crew of the Enterprise led by the James T. Kirk of the new timeline. (Star Trek)
Mirror Universe: In the mirror universe, the Romulans appeared to be uninvolved in the conflict between the Terran Rebellion and the Klingon-Cardassian Alliance.
Benjamin Sisko, posing as his mirror universe counterpart, indicated to Jennifer Sisko that he was going to visit the Romulans to see if he could get their support. This was, in reality, a ruse to explain his return to Deep Space 9. (DS9: "Through the Looking Glass")
STO wiki: Romulans are an offspring species of the Vulcans that emigrated to the planet Romulus ca. 2000 years ago. Romulans are extremely talented at Subterfuge, making their use of Cloaking Devices unparalleled and their damage bonus from de-cloaking higher than that of other species. Additionally, Romulans' Vulcan heritage is reflected in their immense physical strength, making them powerful melee combatants. After a failed coup d'état in 2379 and the destruction of Romulus in 2387, different factions formed among the surviving Romulans.
As of 2409, two major Romulan factions exist:
1. Faction Romulan Republic
The Romulan Republic is based on New Romulus, or "Mol'Rihan", and led by the reunificationist Proconsul D'Tan. The Republic cooperates with the Reman Resistance and is supported by the United Federation of Planets as well as the Klingon Empire.
2. Faction Romulan Star Empire
The Romulan Star Empire (or, as its detractors might say, what's left of the Empire), with its capital Rihan on Rator III, is ruled by Empress Sela and controlled by the oppressive Tal Shiar. Sela has also enlisted the help of Hirogen Hunters and Cardassians of the True Way to strengthen her rule. Moreover, the Star Empire cooperates with the mysterious Elachi and is rumored to be secretly supported by the Iconians.
The Romulans began as a revolutionary group of Vulcans, who were referenced as "those who march beneath the Raptor's wings" and refused to accept the Vulcan philosopher Surak's teachings of complete suppression of emotions. Around AD 400, the dissident group split off from Vulcan society and began the long journey to the planets Romulus and Remus.
The Romulans are of the Vulcan species. One of three theories regarding how the Romulans arrived at the stellar system that includes the planets Romulus and Remus involves Sargon's people, referred to in conjecture as the "Arretians", as mentioned in the Star Trek: The Original Series (TOS) episode "Return to Tomorrow". Sargon claimed that his people had seeded their species throughout the galaxy, and Spock said that could explain some enigmas of Vulcan pre-history. Hanoch, one of Sargon's people and a rival, further claimed that Spock's hybrid Human-Vulcan body was a "good fit" for his alien physiology. If these claims are true, then the Arretians may have been the antecedents for the Romulans — and indeed, they may have also been the species known as the Preservers. The inhabitants of Mintaka III ("Who Watches The Watchers?") seem to support this theory.
Another theory says that Vulcan colonization efforts led to a split, or schism, between factions favoring the school of logic espoused by the philosopher Surak and opposition groups, led by S'task, which ended up leaving Vulcan. However, there is no explicit canon evidence that the group which left Vulcan was in rebellion against Surak. The "Vulcan Soul" Trilogy, written by Josepha Sherman and Susan Shwartz, told the story that it was Surak's idea that some of the Vulcan population should leave their homeworld to find a new home so that the Vulcan race could be preserved due to the endless wars then raging on the homeworld. (Conversely, the Star Trek: Enterprise episode "Awakening" includes a line from the long-deceased Surak referring to the enemies of logic in his time as "those who marched beneath the raptor's wing": this would appear to be a reference to the symbol of the Romulan Empire.) These Vulcans arrived on Romulus and founded what would become the Romulan Star Empire. This theory is supported by a reference within the Star Trek: Enterprise episode "United": Senator Vrax refers to Vulcans as "our distant brothers" during the first part of the episode.
Information from "Balance Of Terror" suggests yet a different theory. While Spock makes it clear that the events during the period of Surak are well documented ("The Savage Curtain"), he is completely uncertain in regard to the origin of the Romulans: "If the Romulans are an offshoot of my Vulcan blood – and I think this likely – then attack becomes even more imperative. Vulcan, like Earth, had its aggressive, colonizing period, and if they have retained that martial philosophy… then weakness is something we dare not show."