The year 2022 marks 2,500 years since Athens, the birthplace of democracy, fought off the mighty Persian empire. Kershaw tells the story of the three epic battles - Marathon, Thermopylae and Salamis - that saved democracy, without which the history of Europe and the West would have been radically different.

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PAUL CARTLEDGE, BBC History magazine

The year 2022 marks 2,500 years since the final defeat of the invasion of Greece by the Persian King Xerxes. This astonishing clash between East and West still has resonances in modern history, and has left us with tales of heroic resistance in the face of seemingly hopeless odds. Kershaw makes use of recent archaeological and geological discoveries in this thrilling and timely retelling of the story, originally told by Herodotus, the Father of History.

The protagonists are, in Europe, the Greeks, led on land by militaristic, oligarchic Sparta, and on sea by the newly democratic Athens; in Asia, the mighty Persian Empire - powerful, rich, cultured, ethnically diverse, ruled by mighty kings, and encompassing modern Iran, Iraq, Turkey, Syria and Egypt.

When the rich, sophisticated, Greek communities of Ionia on the western coast of modern Turkey, rebel from their Persian overlord Darius I, Athens sends ships to help them. Darius crushes the Greeks in a huge sea battle near Miletus, and then invades Greece. Standing alone against the powerful Persian army, the soldiers of Athens' newly democratic state - a system which they have invented - unexpectedly repel Darius's forces at Marathon.

After their victory, the Athenians strike a rich vein of silver in their state-owned mining district, and decide to spend the windfall on building a fleet of state-of-the-art warships.

Persia wants revenge. The next king, Xerxes, assembles a vast multinational force, constructs a bridge of boats across the Hellespont, digs a canal through the Mount Athos peninsula, and bears down on Greece. Trusting in their 'wooden walls', the Athenians station their ships at Artemisium, where they and the weather prevent the Persians landing forces in the rear of the land forces under the Spartan King Leonidas at the nearby pass of Thermopylae. Xerxes's assault is a disastrous failure, until a traitor shows him a mountain track that leads behind the Greeks. Leonidas dismisses the Greek troops, but remains in the pass with his 300 Spartan warriors where they are overwhelmed in an heroic last stand.

Athens is sacked by the Persians. Democracy is hanging by a thread. But the Athenians convince the Greek allies to fight on in the narrow waters by the island of Salamis (underwater archaeology has revealed the Greek base), where they can exploit local weather conditions to negate their numerical disadvantage. Despite the heroism of the Persian female commander Artemisia, the Persian fleet is destroyed.

Xerxes returns to Asia Minor, but still leaves some forces in Greece. In 479 BC