A leading office in the Romulan government, second only to the Praetor, held in 2368 by Neral, who pretends to welcome Spock's hopes of reunification.
Proconsul is a high office of state in the Romulan Star Empire. The holder leads the business of the Senate and stands close to the Praetor in power.
The office is central to The Next Generation two-part story Unification. Spock travels to Romulus in secret because Senator Pardek tells him that the new, young Proconsul Neral is open to talks on reuniting the Romulan and Vulcan peoples. Neral receives Spock warmly, but he is working with Commander Sela, and the talks are cover for an invasion of Vulcan.
A lesser grade also exists. In Face of the Enemy the defector M'ret, whom Troi helps to smuggle off a warbird, is a vice-proconsul. By the time of Deep Space Nine Neral has risen to Praetor, and Senator Vreenak is described as one of his most trusted advisers.