original question: Which fictional universe has fictional calendar system preceded by [First Age]?
answer: middle-earth
answer type: Fictional Universe.
auxiliary information: In the fiction of J. R. R. Tolkien, the First Age, or First Age of the Children of Il√∫vatar is the heroic period in which most of Tolkien's early legends are set. Versions of these stories were later published in The Silmarillion, and tales from this period lend a deep sense of time and history to the later period in which the action of The Lord of the Rings takes place.
The fictional calendar system preceded by [First Age] is a feature of which fictional universe?