(Years are not meant to be exact, and the timeline may not be entirely reliable. Few people in Rhas Cayerne know Realm Years, and the system is not used in Rhas Cayerne. The timeline is mostly meant as an easier way to keep history straight for players.)
???: The First Heroes settle Rhas Cayerne
RY -700?: The light of the First Heroes is extinguished. The world begins an era of decline.
RY -50: Rhas Cayerne has by now degenerated into a chaotic tribal society of constantly warring clans. This is the only world the Knights in the Mountain have known.
RY -5: The Great Contagion and the Fair Folk Invasion claims nearly every life on Rhas Cayerne. Brigid casts her spell on the Knights in the Mountain, putting them to sleep for nearly eight centuries.
RY 0: The Scarlet Empress ascends the throne and creates the Realm.
RY ~100: Rhas Cayerne begins to be repopulated after its destruction in the Great Contagion. The progenitors of the Rhashaan and Cayerne peoples resettle the island. The Sendayi emerge from seclusion in the forests of Cerewyth.
RY 410: The Century of War begins, as the growing populations of the three peoples pit them against each other. Though the Queen will mend their relations, ethnic tensions between Rhashaan, Cayerne and Sendayi persist to this day.
RY 519: Queen Liloka arrives in Rhas Cayerne and begins her great campaign of unification. Over the course of decades, she slowly unites the islands under a single banner, weaving oaths to create a stable system of feudalism.
RY 570: Cinulu becomes the official Capital of Rhas Cayerne, and the Council of Jarls is instituted, managing most of the day-to-day business.
RY 639: Queen Liloka departs Rhas Cayerne, leaving the islands in the care of the Sovereign Prince. The same year, the Realm formally declares Rhas Cayerne a satrapy and installs the 23rd Legion in Cinulu. The satraps are content to leave most governing to the Council of Jarls and the Sovereign Prince, and the Realm generally rules with a light hand.
RY ~700: Somewhere around the beginning of the eighth century, Crioch Rhas Dunn and the rest of the Greatest Generation are born. As they come of age, Rhas Cayerne prospers from their trading, raiding and adventuring.
RY 763: The Scarlet Empress disappears, though her disappearance is kept secret for years, and is still merely a whispered rumor in Rhas Cayerne, heard by few.
RY 767: Boudicca Rhas Cynefin slays Peleps Kalok Raynn, starting the Civil War. The same year, Boudicca slays the Sovereign Prince Maeraigh, thereby throwing the Council of Jarls into chaos.
RY 768: Present year.