The 21st century BC was a century that lasted from the year 2100 BC to 2001 BC. Events. Ur-Nammu (seated) bestows governorship on Ḫašḫamer, patesi (high priest) of Iškun-Sin (cylinder seal impression, ca. 2100 BC).

The 31st century BC was a century that lasted from the year 3100 BC to 3001 BC. Events. Spiral design altar block from the Tarxien Temples of Malta, uncovered by Sir Themistocles Zammit. Front and Back Sides of Narmer Palette, ...