Demosthenes (384 - 322 BCE, Greek: Δημοσθένης, Dēmosthénēs) was a prominent Greek statesman and orator of ancient Athens. His orations constitute a significant expression of ancient Athenian intellectual prowess and provide a thorough insight into the politics and culture of ancient Greece during the 4th century BC. Demosthenes learned rhetoric by studying the speeches of previous great orators. He delivered his first judicial speeches at the age of twenty, in which he argued effectively to gain from his guardians what was left of his inheritance. For a time, Demosthenes made his living as a professional speech-writer (logographer) and a lawyer, writing speeches for use in private legal suits.
Demosthenes grew interested in politics during his time as a logographer, and in 354 BCE he gave his first public political speeches. He went on to devote his most productive years to opposing Macedon's expansion. He idealized his city and strove throughout his life to restore Athens' supremacy and motivate his compatriots against Philip II of Macedon. He sought to preserve his city's freedom and to establish an alliance against Macedon, in an unsuccessful attempt to impede Philip's plans to expand his influence southwards by conquering all the Greek states. After Philip's death, Demosthenes played a leading part in his city's uprising against the new King of Macedon, Alexander the Great. However, his efforts failed and the revolt was met with a harsh Macedonian reaction. To prevent a similar revolt against his own rule, Alexander's successor, Antipater, sent his men to track Demosthenes down. Demosthenes took his own life, in order to avoid being arrested by Archias, Antipater's confidant.
The Alexandrian Canon compiled by Aristophanes of Byzantium and Aristarchus of Samothrace recognized Demosthenes as one of the ten greatest Attic orators and logographers. According to Longinus, Demosthenes "perfected to the utmost the tone of lofty speech, living passions, copiousness, readiness, speed". Cicero acclaimed him as "the perfect orator" who lacked nothing, and Quintilian extolled him as "lex orandi" ("the standard of oratory") and that "inter omnes unus excellat" ("he stands alone among all the orators").