when was the great pyramid of giza built

The Great Pyramid of Giza was built during the reign of Pharaoh Khufu, roughly between about 2580 and 2560 BCE, so it’s a little over 4,500 years old.

Here’s a quick breakdown:

• Most Egyptologists place its construction in the Fourth Dynasty of Egypt’s Old Kingdom, during Khufu’s reign (often dated about 2589–2566 BCE).

• A commonly cited working range for the actual building is around 2580–2560 BCE , based on historical records and modern analyses like radiocarbon dating of organic material in the mortar.

• Modern summaries and encyclopedias likewise describe it as the largest Giza pyramid, built as Khufu’s tomb and completed in the mid‑26th century BCE.

So, if you’re asking “when was the Great Pyramid of Giza built,” the concise answer used in most modern references is: around 2580–2560 BCE, during the reign of Pharaoh Khufu.