The United Planets of Earth was the name of the Human government from SEY 2523 to 2546. It was led by a Tribunal composed of a High-Advocate, a High-General, and a High-Secretary along with a Senate populated by elected representatives from all Human-controlled planetary systems.
During this time, Humans introduced a unified currency, made first contact with the Xi'an and Tevarin, and engaged in the First Tevarin War. Ivar Messer I's ascendancy to Prime Citizen in 2546 marked the end of the era as he transitioned the government into the United Empire of Earth.