Sunda Strait marks the spot where, sometime around AD 535, a volcanic eruption blew into the stratosphere the land that used to join Sumatra to Java. The resulting dust veil caused global cooling and drought. This is thought to have changed the course of history for every civilisation on the planet.
For example, the drought in the East African grasslands that followed the volcanic eruption is thought to have unleashed the Black Death. Rodents have a shorter gestation period than their predators so their numbers recovered more quickly once the rains returned. This led to a population explosion and they had to venture further afield in search of food. They took their flea passengers beyond one of the natural reservoirs for plague and into areas where there was no natural immunity. For me the most interesting thing is that the fleas themselves are susceptible to plague. Within a fortnight of infection their guts get blocked. Starving, they suck the blood of anything that moves. This is how the plague was passed to humans. Black rats and their fleas stowed away on ships exporting ivory from the Egyptian port of Pelusium to the Roman ( Byzantine ) Empire and the inevitable happened.
Before AD 535 the Avars dominated the Mongolian Steppe. The lynch-pin of their power was the horse but horses are only able to absorb 25% of the protein they consume, making them ill-equipped to cope with the drought that followed the eruption. The balance of power tipped in favour of the Turks and the Avars left to build a new empire in eastern Europe. They forged an alliance with Persia to terrorise the Byzantine Empire, already weakened by the plague. This crippled both Persia and Rome, allowing Islam to emerge unchallenged. In this way Keys shows that every major civilisation underwent a major transformation, coinciding with the AD 535 eruption. Some, like China and Korea, were forged. Others, like Teotihuacan, collapsed.
After all the painstaking research, some details were overlooked. None of the few maps or diagrams were referred to from the text and they always appeared many pages after they were relevant. While the direct translations of contemporary writers might appeal to die-hard historians, this approach interrupted the flow of the narrative. David Keys could have told this fascinating story twice as well in a book half its length. It had more impact as two episodes of the TV series 'Secrets of the Dead' broadcast on Channel 4 last year.
Mike Follows