In the 21st century, the planet was colonized by a faction of the Heiren species, known as the Heir'och. They had abandoned their homeworld on Heir'tzan because of their growing problems with the main Heir'tza faction.
However after a century, an interplanetary war broke out between the two planets which was started other ecomomic, cultural, and religious reasons. The war raged for nearly a century, but eventually a cease fire was drawn up. Despite the tentative peace, the governments on both planets kept their military spending up and the two were ready for the war to begin at a moments notice.
In the late 22nd century, it was discovered that once or twice in a generation, a powerful telepath is born. Both sides realised that the best chance for reconciliation was for a telepath to be born to each side. This didn't occur until the mid-23rd century, and then preparations began for the reconciliation.
In 2251, the ceremony of reconciliation was planned to take place in the capital city of Heir'at on Heirt'zan. Even though modern technology and weapons weren't allowed at the ceremony, there were still concerns that members of each faction would attempt to assassinate the telepaths. (TOS - My Brother's Keeper novel: Republic)