Epaminondas in the context of "Pallantium (Arcadia)"

The Kingdom of Macedon possessed one of the greatest armies in the ancient world. It is reputed for the speed and efficiency with which it emerged from Greece to conquer large swathes of territory stretching from Egypt in the west to India in the east. Initially of little account in the Greek world, it was widely regarded as a second-rate power before being made formidable by Philip II, whose son and successor Alexander the Great conquered the Achaemenid Empire in just over a decade's time.

The latest innovations in weapons and tactics were adopted and refined by Philip, and he created a uniquely flexible and effective army. By introducing military service as a full-time occupation, Philip was able to drill his men regularly, ensuring unity and cohesion in his ranks. In a remarkably short time, this led to the development of one of what was among the world's finest military machines for the era. Tactical improvements included the latest developments in the deployment of the traditional Greek phalanx made by men like Epaminondas of Thebes and Iphicrates of Athens. Philip improved on these military innovators by using both Epaminondas' deeper phalanx and Iphicrates' combination of a longer spear and a smaller and lighter shield. However, the Macedonian king also innovated; he introduced the use of a much longer spear, the two-handed pike. The Macedonian pike, also known as the sarissa, gave its wielder many advantages both offensively and defensively. For the first time in Greek warfare, cavalry became a decisive arm in battle. The Macedonian army perfected the co-ordination of different troop types in an early example of combined arms tactics—the heavy infantry phalanx, skirmish infantry, archers, light cavalry and heavy cavalry, and siege engines were all deployed in battle; each troop type being used to its own particular advantage and creating a synergy of mutual support.

The Theban hegemony lasted from the Theban victory over the Spartans at Leuctra in 371 BC to another victory over the Spartans at Mantinea in 362 BC, which was, however, indecisive and greatly weakened both sides. Still, Thebes sought to maintain its position until finally eclipsed by the rising power of Macedon in 335 BC.

Externally, the way was paved for Theban ascendancy by the collapse of Athenian power in the Peloponnesian War (431–404 BC), through the weakening of the Spartans by their oliganthropia (demographic decline) and by the inconclusive Corinthian War (395–386 BC). Internally, the Thebans enjoyed two temporary military advantages:

The helots (/ˈhɛləts, ˈhiːləts/; Greek: εἵλωτες, heílotes) were a subjugated group that constituted a majority of the population of Laconia and Messenia – the territories ruled by Sparta in Ancient Greece. There has been controversy since antiquity as to their exact characteristics, such as whether they constituted an Ancient Greek tribe, a social class, or both. For example, Critias described helots as "slaves to the utmost", whereas according to Pollux, they occupied a status "between free men and slaves". Tied to the land, they primarily worked in agriculture as a majority and economically supported the Spartan citizens.

The proportion of helots in relation to Spartan citizens varied throughout the history of the Spartan state; according to Herodotus, there were seven helots for each of the 5,000 Spartan soldiers at the time of the Battle of Plataea in 479 BC. Thus the need to keep the helot population in check and to prevent rebellion were major concerns of the Spartans. Helots were ritually mistreated and humiliated. Every autumn the Spartan polis declared war on the helots, allowing them to be killed and abused by members of the Crypteia without fear of religious repercussion. Uprisings and attempts to improve the lot of the helots did occur, such as the conspiracy of Cinadon of 399 BC. Plato on the other hand does not mention the killings by the Crypteia at all in Laws. The population was largely liberated by the Theban commander Epaminondas following the Theban-Spartan War.

The Battle of Mantinea was fought on 4 July 362 BC between the Thebans, led by Epaminondas and supported by the Arcadians, Argives, Messenians, Thessalians, Euboeans and the Boeotian league against the Spartans, Eleans, Athenians, and Mantineans. The battle was to determine which of the two alliances would dominate Greece. However, the death of Epaminondas and his intended successors would cost Thebes the military leadership and initiative to maintain Theban supremacy in the region. Similarly, the Spartans were weakened by yet another defeat and loss of troops. Epaminondas' death coupled with the impact on the Spartans of yet another defeat weakened both alliances, and paved the way for Macedonian conquest led by Philip II of Macedon.

Leuctra or Leuktra (Ancient Greek: τὰ Λεῦκτρα, romanized: tà Leûktra, Attic Greek pronunciation: [tà lêu̯k.tra] or τὸ Λεῦκτρον, tò Leûktron [tò lêu̯k.tron]) was a village in ancient Boeotia, situated on the road from Thespiae to Plataea, and within the territory of the former city. Leuctra is most notable for the Battle of Leuctra, fought in its neighbourhood between the Spartans and Thebans in 371 BCE, by which the supremacy of Sparta was demolished. In the plain of Leuctra, was the tomb of the two daughters of Scedasus, a Leuctrian. The daughters were violated by Spartans, and had afterwards slain themselves. Before the battle, Epaminondas crowned the tomb with wreaths, fulfilling an oracle's prophecy that the Spartans would be defeated at this spot.

The site of Leuctra is near the modern village of Lefktra, renamed to reflect to connection with the ancient place.

The Theban–Spartan War of 378–362 BC was a series of military conflicts fought between Sparta and Thebes for hegemony over Greece. In 378 BC, led by General Epaminondas, Thebes revolted against its Spartan garrison and successfully repelled Spartan offensives. A clever tactician, Epaminondas crushed the hitherto invincible Spartan army at Leuctra in 371 BC, therefore ending Sparta's hegemony and starting Thebes' own hegemony over Greece. After Leuctra, the war continued in the Peloponnese, where Sparta was fighting for survival. In 362 BC, the Battle of Mantinea was a new victory for Thebes, but Epaminondas was also killed. The conflict ended soon after with a treaty of general peace signed by all the belligerents, except Sparta, which was by now isolated and permanently weakened.

Lysis of Taras (/ˈlaɪsɪs/; Greek: Λῦσις; fl. c. 5th-century BC) was a Greek philosopher. His life is obscure. He was said to have been a friend and disciple of Pythagoras. After the persecution of the Pythagoreans at Croton and Metapontum in Magna Graecia he escaped and went to Thebes, where he became the teacher of Epaminondas, by whom he was held in the highest esteem. There are, however, serious chronological difficulties with his being both a disciple of Pythagoras and the teacher of Epaminondas. Some of the commentators and doxographers have failed to distinguish between the two different anti-pythagorean revolutions: the first one around ~500, when Pythagoras himself died, and the second one fifty years later. This could clarify the source of the chronological incoherence.

Lysis was credited as the actual author of a work which was attributed to Pythagoras himself. Diogenes Laërtius quotes from an undoubtedly spurious letter from Lysis to Hippasus as an authority for some statements concerning Damo.