28th century BC(29th century BC - 28th century BC - 27th century BC - other centuries)
- 2925 - 2776 BC - First Dynasty wars in Egypt
- 2900 - 2334 BC - Mesopotamian wars of the Early Dynastic period
- 2775 - 2650 BC - Second Dynasty wars in Egypt
- 2750 BC - End of the Early Dynastic I Period, and the beginning of the Early Dynastic II Period in Mesopotamia.
- circa 2750 BC -- Silbury Hill begun