The Romulan Republic was a government formed out of the ashes of the fallen Romulan Star Empire following the destruction of the Romulan homeworld, Romulus. The Republic was formed in 2409, and its first elected leader was Proconsul D'Tan.
On stardate 83626.4, Subcommanders Kaol and Mivek visited the crew of the USS Leviathan as a gesture of peace between the Republic and the Federation. Kaol told the Leviathan's senior staff that, although they were still a newly-formed government, they had "already taken great steps toward true independence in the past year. Proconsul D'Tan ha[d] begun to unite [their] people in ways not seen since before the destruction of Romulus nearly 22 years ago."
The Republic also had reached out to the Remans, who had long been subjugated by the old Romulan government. Kaol stated that "they are our relations. They have a right in our inheritance as much as we do."