The government of Tellar Prime, represented by blunt and argumentative ambassadors such as Gral and Gav, which moved from open hostility towards Andoria to become a founding member of the Federation.
The Tellarite government speaks for a people who treat argument as a courtesy. In the Enterprise episodes Babel One and United, Ambassador Gral leads its delegation to trade talks with the Andorians that Earth has offered to mediate, while a disguised Romulan drone ship attacks both sides to set them against each other.
Jonathan Archer persuades Gral and the Andorian Shran to pool their ships with those of Earth and Vulcan to hunt the drone, an alliance that points towards the Coalition of Planets seen in Demons and Terra Prime and to the founding of the Federation in 2161.
A century later, in the Original Series episode Journey to Babel, Tellar's ambassador Gav opposes the admission of Coridan and quarrels with Sarek before being murdered aboard the Enterprise.