Long before Nike shoes or even the ancient Greeks worshipped the goddess Nike, archeologists believe a recently-discovered footprint was cast in western Egypt.
The African country's antiquities chief says it could be the world's oldest known footprint.
'This could go back about two million years,' said Zahi Hawass, the secretary general of the Egyptian Supreme Council of Antiquities.
He added: 'It could be the most important discovery in Egypt."
Archaeologists found the footprint, imprinted on mud and then hardened into rock, while exploring a prehistoric site in Siwa, a desert oasis.
Scientists are using carbon tests on plants found in the rock to determine its exact age, Mr Hawass said.
Khaled Saad, the director of prehistory at the council, said that based on the age of the rock where the footprint was found, it could date back even further than the renowned three million year-old fossil Lucy, the partial skeleton of an ape-woman found in Ethiopia in 1974.
Most archaeological interest in Egypt is focused on the time of the pharaohs.
Previously, the earliest human archaeological evidence from Egypt dated back around 200,000 years, Mr Saad said.
