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Alexander III of Macedon was a king of the ancient Greek kingdom of Macedon and a member of the Argead dynasty. He was able to succeed his father Philip II to the throne at the age of twenty. He created one of the largest empires of the ancient world by the age of thirty, stretching from Greece to northwestern India. He was undefeated in battle and is widely considered one of history's most successful military commanders. Alexander was awarded the generalship of Greece and used this authority to launch his father's Pan-Hellenic project to lead the Greeks in the conquest of Persia. Alexander broke the power of Persia in a series of decisive battles, most notably the battles of Issus and Gaugamela. At that point, his empire stretched from the Adriatic Sea to the Indus River. Alexander's legacy includes the cultural diffusion and syncretism which his conquests engendered, such as Greco-Buddhism. He founded some twenty cities that bore his name, most notably Alexandria in Egypt. Alexander became legendary as a classical hero in the mold of Achilles, and he features prominently in the history and mythic traditions of both Greek and non-Greek cultures. He became the measure against which military leaders compared themselves, and military academies throughout the world still teach his tactics. He is often ranked among the most influential people in history.