Thodron

Thodron, once known as Levalius by the High Republic (Republic Standard: Thodronese: Thodronus) is a heavily-populated ecumenopolis and the capital of the Empire of Thodron. As the center of Imperial life, the planet is rich with history, education, art, and culture. It is one of the oldest continuously habited planets in history.

Description
Its city-laden surface, slowly built up over many millennia, comprises nearly 480 floors, the lowest of which provide an ancient foundation and support for the much newer layers above. Thodron itself is considerably old compared to galactic society, as the Thodroni, natives of the planet, are one of the most successful species in the galaxy.

Thodron orbits Oculus Eliari, a G-type main sequence star and the most important energy source for the planet; the stellar ring built around the star absorbs energy released from it, which is then used to power the planet. This provides a much cleaner, reliable, and efficient source of energy for the people living below. Resting around the planet is its signature, distinctive ring, used primarily as a docking port for incoming ships.

Ancient times
The earliest Thodroni records from around 7100 BC mention the Yaer'aed, a galactic empire that once spanned a good part of Andromeda before its mysterious disappearance, and their arrival and subsequent colonization sometime around 7500 BC.