Kozhun

Known as the "Evil Dragon" or the "Dragon Tyrant", this green dragon swept out of the lands south of Ikela with an army of zandolit, humans, and other dragons, along with some dragon riders, in about 250 BC. He conquered what is now Ikela and subjugated its peoples under his claws.

His capital was in the middle of the great "island" of Jaoshepar, building a city that was abandoned after his fall (and considered cursed). The proximate cause, as discovered by the Nameless Soefra Party, was that a devil-inspired group of assassins from the Kingdom of Mirzapor had slaughtered his mate Aluadi and his young clutch of children under the banner of an emissaries..

Policies

Kozhun's policies are best described as "stationary bandit". He extorted taxes and slaves from the conquered peoples, subjecting them (via viceroys) to his every whim. Rebellion, refusal to pay taxes, or even just displeasing him (or failing to amuse him) resulted in raids by his draconic allies.

Downfall

In 97 AC, heroes gathered in Mirzapur and a rebel army (aided by the Moonshell Dragon Flight and the undersea residents of Ikel'Mer) drew the Kozhun's attention (and that of his forces) away from the heroes. They entered his lair, destroyed the source of his power (said to have been stolen souls trapped in glass vessels), causing him to falter and be downed by the ancient of the Moonshell. He was then killed by the common folk of the rebel army and his army was scattered.

Of course, not everyone agrees with this tale...

Other Timelines

In another timeline, nameless adventurers saved his mate from the assassins and forestalled a war of retribution. In that timeline, the Kingdom and the Dragon became friends, until 96 AC when the Kingdom fell to devil-worshipers of the cult of Korv'al'zagan and raised a fiendish army to besiege his capital. More nameless adventurers assisted him in holding out, preventing the initial fall of the walls to treachery and providing critical assistance against the fiend-dragon leader of the invasion. They held out until Aluadi and their allies among the Red Lightning flight arrived. What happened after that is unknown to the prime timeline.

In yet another, where the gwerin did not retreat from the Great Rift, Kozhun and Aluadi were local rulers, peacefully coexisting with the other kingdoms. When the Fragment was released from its prison in 247 AC (the cause of the Reweaving in the prime timeline) and gathered its army of corrupted creatures, Kozhun, Aluadi, and the hosts of heavens and hells gathered at Greenwood Reach for the final battle, with the failsafe of angelic destruction of the continent. The suspiciously timely arrival of yet more nameless adventurers (who seemed to be similar to the ones from the other timelines) allowed the Right Eye of Qa'desh to be brought to a ritual, which weakened the Fragment and protected the allies long enough for them to banish it to the Oblivion Gate, weakening its influence across all timelines.