His first step was to ditch the word civilisation, a term he argues is really propaganda by rulers. “When you look at the near east, China, Mesoamerica or the Andes, where the first kingdoms and empires arose, you don’t see civilised conduct, you see war, patriarchy and human sacrifice,” he says. This was a form of evolutionary backsliding from the egalitarian and mobile hunter-gatherer societies which shared tools and culture widely and survived for hundreds of thousands of years. “Instead, we started to resemble the hierarchies of chimpanzees and the harems of gorillas.”

Instead Kemp uses the term Goliaths to describe kingdoms and empires, meaning a society built on domination, such as the Roman empire: state over citizen, rich over poor, master over slave and men over women. He says that, like the biblical warrior slain by David’s slingshot, Goliaths began in the bronze age, were steeped in violence and often surprisingly fragile.