The beginning of the break-away faction is marked by Donatra declaring herself Empress of the "Imperial Romulan State" and taking over several agricultural worlds of the Star Empire, thereby threatening Romulus with severe food shortages. In 2383, a Star Empire fleet under Fleet Commander and Proconsul Tomalak is defeated by Donatra's forces at Xanitla. During the battle, Tomalak's second-in-command, Admiral Taris defects to the Imperial State.
One year later, Empress Donatra agrees to a conference to discuss the creation of new borders and the establishment of a neutral zone between the two Romulan factions. Admiral Taris is sent to the Romulan capital as Donatra's representative, but is later recalled after being accused in taking part in the assassination on Praetor Tal'aura, the head of the Star Empire. In 2385, Donatra meets with then-Proconsul Sela and Rehaek on Romulus to find a peaceful diplomatic solution. The worlds of the Imperial Romulan State are folded back into the Romulan Star Empire, but Donatra maintained control of her military and kept them off-world in the event the peace would not last. Donatra's disappearance in 2387 marked the ultimate end of the idea of an Imperial Romulan State, and it would take until 2409 until another notable Romulan-Reman faction would emerge: The Romulan Republic.
As the timeline of Star Trek Online only incorporates certain soft-canon information, its history of the Imperial Romulan State is somewhat different. The Star Trek: Destiny trilogy and A Singular Destiny show the Imperial State to already be created in 2380 as well as invited to become a part of the expanded Khitomer Accords, before being reabsorbed into the Star Empire in 2382, which differs from STO's timeline.
Romulan Star Empire (25th century)
|Details||Romulan Star Empire (25th century) • Romulan • Reman • Hirogen • Rator III • Gasko Station • Tal Shiar • Romulan History|
|Ground Forces||Romulan Analyst • Technician • Recruit (Romulan) • Uhlan • Sublieutenant Medic • Centurion • Centurion Engineer • Centurion Medic • Centurion Scientist • Subcommander • Subcommander Engineer • Subcommander Scientist • Commander • Romulan Captain|
|Starships||Romulan Shuttle • Scorpion Fighter • T'varo Light Warbird • Mogai Heavy Warbird • D'deridex Battlecruiser • Scimitar Dreadnought|
|NPCs||Arranhu • Charva • Hakeev • Janek • Khaiel N'Vek • Khiana • Ruul • Sela • Taris • Tarsen|
|NPC starships||I.R.W. Aethra • I.R.W. Areinnye • I.R.W. Esemar • I.R.W. Falcata • I.R.W. Khnial • I.R.W. Leahval • I.R.W. Rea • Sela's Armed Freighter • I.R.W. Sithesh|