Largely a Cascadian term referencing the era (CE 393 - 500) that began shortly after the state marriage between Princess Nadeera Ashoa M’latti Nerafahn of the Sudaani imperial family and the Winslows, Cascadia’s powerful, though thoroughly disliked ruling family. Though she never assumed the throne in her own person, Princess Nadeera achieved a high level of popularity with the people and most of the nobility. Intelligent and highly educated, Nadeera was also a vivacious and charismatic young woman with a great deal of personal energy, and an unerring eye for color and composition. Her influences extended into the arts, philosophy, and architecture as well as personal appearance.
Within ten years of her arrival and marriage to Prince Altheon Winslow, Nadeera had managed to turn her personal style into a cultural movement that went on to span three decades. The ruling Paladin nobility and the Urilian aristocracy had slavishly emulated her personal style when it came to flaunting their wealth, but they had been much less ready to embrace her social reforms, which included an almost-constant outpouring of money and effort during the bubonic plague outbreak in CE 429, and during its extensive aftermath.
The Nadrean era is generally considered to have ended about 30 years after Nadeera's death, or by the year 500. By that time, three decades of war had changed the face of Cascadia completely.