Onderon had four moons. Dxun, the primary moon, once orbited very close to the planet, allowing some animals to fly between the planet and the moon. The other three moons were Dagri, Evas and Suthre.
The native Humans of Onderon struggled against the beasts, eventually gathering new technologies and building a huge walled city, Iziz, to protect themselves. Like the people of many other fringe worlds, the Onderonians had a distrust of non-Humans.
In 4,400 BBY, Freedon Nadd conquered the planet and established a dark side theocracy. These cultists were known as Naddists. Naddist tyrants included Warb Null and King Ommin. The Naddists sent Iziz’s criminal element (opponents of the Naddists) out into the wilderness without any protection from the animals. These outcasts soon learned to defend themselves, and eventually formed a second civilization, the Beast Riders. Relations between the two groups were hostile, and they remained at war with each other for many years. The Beast Wars lasted from 4,350 BBY to 4,000 BBY, with the final battles serving as the opening salvos of the Great Sith War.
Ommin was crowned King in the year 4,018 BBY, taking Amanoa as Queen. Novar was appointed Minister of State in 4,013 BBY. In 4,002 BBY, Onderon joined the Galactic Republic. The Republic asked the Jedi to watch over the world. Jedi Master Arca Jeth was selected as Watchman, and assigned his Padawans Ulic Qel-Droma, Cay Qel-Droma, and Tott Doneeta to the planet in a test-capacity. The Beast Wars finally ended with the death of Naddist Queen Amanoa. Amanoa’s daughter Galia married Oron Kira, the leader of the outcasts, known as the “Beastprince.”
In 3,998 BBY, two years after the First Battle of Onderon, the Naddist Uprising occurred. The Naddists tried to overthrow Galia, but were foiled by the Jedi and the Republic. Ommin and Sith disciple Warb Null were slain, but so was Jedi Kith Kark.
In more ancient times, the sociopolitical situation between the Onderonian beast-riders and the people of Iziz was far different from the present day. Formerly untamed and coarse, many of the wilderness Beast Lords prospered during the several decades since the end of the Great Sith War, thanks to off-world trade going back two generations (marked in the game by Oron Kira’s marriage to the Iziz royal house, thus uniting the bloodlines).