Herod the Great's fortified complex at Masada was a winter retreat but also an insurance against a feared rebellion of his Jewish subjects or an attack from Rome. Luxurious palaces, barracks, well-stocked storerooms, bathhouses, water cisterns sat on a plateau 400m above the Dead Sea and desert floor. Herod's personal quarters in the Northern Palace contained lavish mosaics and frescoes.

But by the time the Jews revolted against the Romans, Herod had been dead for seven decades. After the temple in Jerusalem was destroyed, the surviving rebels fled to Masada, under the command of Eleazer Ben Yair. Around 960 men, women and children holed up in the desert fortress as 8,000 Roman legionnaires laid siege from below.

Using Jewish slave labour, the Romans built a gigantic ramp with which they could reach the fortress and capture the rebels. On 15 April in the year 73CE, Ben Yair gathered his people and told them the time had come to "prefer death before slavery". Using a lottery system, the men killed their wives and children, then each other, until the last survivor killed himself, according to historian Flavius Josephus's account....