Consul
From Memory Alpha, the free Star Trek reference
A consul is an official appointed by a government to reside outside the government's territory and oversee that government's interests and provide assistance to its citizens abroad.
Consuls were among the highest officials in the Romulan Senate. Admiral Valdore promised Senator Vrax that he would be first consul in the Senate. (ENT: "The Aenar")
In 2287, General Korrd was the Klingon consul to the Planet of Galactic Peace. (Star Trek V: The Final Frontier)
In 2375, Burkus served as the Deputy Consul of the Monean Maritime Sovereignty. (VOY: "Thirty Days"
