III sent a force to Crete in 333 BC with the aim of securing the island for Sparta. Agis next took command of allied Greek forces against Macedon, gaining early successes, before laying siege to Megalopolis in 331 BC. A large Macedonian army under general Antipater marched to its relief and defeated the Spartan-led force in a pitched battle. More than 5,300 of the Spartans and their allies were killed in battle, and 3,500 of Antipater's troops. Agis, now wounded and unable to stand, ordered his men to leave him behind to face the advancing Macedonian army so that he could buy them time to retreat. On his knees, the Spartan king slew several enemy soldiers before being finally killed by a javelin. Alexander was merciful, and he only forced the Spartans to join the League of Corinth, which they had previously refused to join.
Even during its decline, Sparta never forgot its claims on being the "defender of Hellenism" and its Laconic wit. An anecdote has it that when Philip II sent a message to Sparta saying "If I enter Laconia, I will raze Sparta", the Spartans responded with the single, terse reply: "If."
When Philip created the league of the Greeks on the pretext of unifying Greece against Persia, the Spartans chose not to join—they had no interest in joining a pan-Greek expedition if it was not under Spartan leadership. Thus, upon the conquest of Persia, Alexander the Great sent to Athens 300 suits of Persian armour with the following inscription Alexander, son of Philip, and all the Greeks except the Spartans, give these offerings taken from the foreigners who live in Asia.
During the Punic Wars Sparta was an ally of the Roman Republic. Spartan political independence was put to an end when it was eventually forced into the Achaean League. In 146 BC Greece was conquered by the Roman general Lucius Mummius. During the Roman conquest, Spartans continued their way of life, and the city became a tourist attraction for the Roman elite who came
