Anno Imperialis

Anno Imperialis (AI) is the method of measuring years in the Aurelian Empire.

The year 0 AI is set as the year in which Tullus Iulius Praeceptus reformed the Auran Republic into the Aurelian Empire.

Dates prior to this are usually appended with Prior to Reformation (PR), indicating that the year is counting backwards from 0 AI. Alternatively, the dates may be written as a negative number, i.e. -100 AI is the same as 100 PR.