| Clue | Source | Date |
|---|---|---|
| *Period of Egypt's history known as the 'Age of the Pyramids' | Wall Street Journal | 14 Jan 2019 |
| *Period of Egypt's history known as the "Age of the Pyramids" | ||
| Third-millennium-B.C. period in Egypt | USA Today | 02 Jun 2016 |
| Third-millennium-B.C. period in Egypt | ||
| Egyptian dynasties before 2500 B. C. |