- The failure of the Rule of Man triggered the collapse of most of interstellar civilization. While interstellar travel and commerce continued, it was at a greatly reduced rate, and the many worlds of the Imperium turned in on themselves.
- The period of collapse is termed Twilight and lasted for two and a half centuries.
Non-canon: It can be argued that Twilight began with the death of Empress Elize in -1997, causing factions of the Council of Noble Officers to elect rival Emperors ruling from Hub/Ershur and Antares, in effect creating two different Imperial governments, the Hub/Ershur Imperium and the Antares Imperium. However, from -1997 to -1776, the two de facto governments retained a common currency and money system and maintained the fiction that they were still part of the same Imperium for several centuries.
History & Background (Dossier)
Modern historians consider Twilight to have begun in -1776 when the treasury on Hub/Ershur refused to acknowledge a monetary issue of the branch treasury at Antares, triggering a financial collapse and the destruction of large-scale trade within the Imperium.
- The end of Twilight is commonly accepted as the year -1526, when the last governmental body claiming to be the Rule of Man ceased to exist. Thus began the Long Night.