Based on the provided information, the Prehistoric Era came first.
Historical Eras Timeline
The following table outlines the major historical eras and their respective dates, according to the provided reference:
| Major Historical Eras | Dates |
|---|---|
| Prehistoric Era | 2.5 million years ago - 600 B.C.E. |
| The Middle Ages | 476 C.E. - 1450 C.E. |
| Early Modern Era | 1450 C.E. - 1750 C.E. |
| Modern Era | 1750 C.E. - Present |
As evidenced by the timeline, the Prehistoric Era, starting approximately 2.5 million years ago, predates all other listed periods.
