1. Egypt (~3,100 to 4,000 Years)
The unification of Egypt in 3100 B.C. is the standard starting date for ancient Egyptian civilization. Egypt’s original name meant “the Two Lands” because it was divided between Upper Egypt (in the South) and Lower Egypt (in the North).
In 3100, a southern king named Menes (or Narmer) conquered the north and founded what’s known as “Dynasty 0,” the very first Egyptian dynasty. But Darnell contends that the real origins of Egyptian civilization began centuries before.
“Egyptian culture, based on Egyptian art and writing as a continual development that we can trace—I would say you would have to begin its origins no later than 4000 B.C.,” says Darnell.
That might seem very early, but Darnell says that the common vocabulary of images used in Egyptian hieroglyphics was created during the Naqada culture that flowered in Upper Egypt before unification.
“The Egyptians, prior to developing what we think of as writing, had created a way of commenting on and even describing the cosmos using certain groupings of images,” says Darnell.
In his fieldwork, for example, Darnell found a set of monumental, rock-carved hieroglyphics dating to 3250 B.C. containing images of bulls, storks, ibises and other symbols. Those same hieroglyphic motifs first appeared in the Naqada period and continued throughout ancient Egyptian history.
When did Egyptian civilization end? That’s another tricky question. Egypt was conquered by Alexander the Great in 332 B.C., but Egyptian civilization retained its gods and pharaohs for centuries. The Ptolemaic Dynasty, established by Macedonian Greeks, ruled in Egypt as pharaohs, including the famous Cleopatra VII.
In 31 B.C., the Roman Emperor Octavian (Augustus) defeated Cleopatra and Marc Antony, ending pharaonic rule and folding Egypt into the Roman Empire. Darnell argues that Egyptian civilization continued until the “triumph of Christianity” in the Byzantine Era, but 31 B.C. is a more conservative cut-off.
Depending on whether you accept Darnell’s earlier date of 4000 B.C. or prefer the unification of Egypt in 3100 B.C., ancient Egypt lasted for either roughly 3,100 years or 4,000 years.
2. Mesopotamia (~3,000 Years)
The first people settled the fertile lands between the Tigris and Euphrates Rivers (modern-day Iraq) as early as 14000 B.C. But by roughly 3500 B.C., Mesopotamia had achieved all of the classical milestones of civilization.
Mesopotamians built the world’s first large cities, including Uruk, home to more than 50,000 people at its peak. They constructed monumental temples to their chief god, Marduk. In addition to farming, Mesopotamians worked as potters, metalworkers, priests and government administrators. And they kept detailed records using arguably the first system of writing, cuneiform.
"Cuneiform developed as a series of notational marks for economic transactions,” says Darnell. “So, whereas Egyptian hieroglyphics began as religious commentary used in art, cuneiform started as kind of an economic, transactional system that only later became phonetic writing.”
For three millennia, Mesopotamia was ruled by a series of powerful cultures and empires, including the Sumerians, Babylonians, Hittites, Assyrians and Neo-Babylonians. In 539 B.C., Babylon was invaded and overtaken by Cyrus II of Persia, bringing an end to one of the first and longest-lasting civilizations in history.