Hellenistic civilization (Greek civilization beyond classical Greeks) represents the zenith of Greek influence in the ancient world from 323 BC to about 146 BC (or arguably as late as 30 BC). Hellenistic civilization was preceded by the Classical Hellenic period, and followed by Roman rule over the areas Greece had earlier dominated – even though much of Greek culture, religion, art and literature still permeated Rome's rule, whose elite spoke and read Greek as well as Latin.
The spread of Hellenistic cultures was sparked by the conquests of Alexander the Great. After his ventures of the Persian Empire, Hellenistic kingdoms were established throughout south-west Asia (the 'Near' and 'Middle East') and north-east Africa (ancient Egypt and Cyrene in ancient Libya). This resulted in the export of Greek culture and language to these new realms, and moreover Greek colonists themselves. Equally, however, these new kingdoms were influenced by the indigenous cultures, adopting local practices where beneficial, necessary or convenient.
Alexander III of Macedon (20/21 July 356 – 10/11 June 323 BC), commonly known as Alexander the Great (Greek: Ἀλέξανδρος ὁ Μέγας, Aléxandros ho Mégas from the Greek αλέξω alexo "to defend, help" + ανήρ aner "man"), was a king of Macedon, a state in northern ancient Greece. Born in Pella in 356 BC, Alexander was tutored by Aristotle until the age of 16. By the age of thirty, he had created one of the largest empires of the ancient world, stretching from the Ionian Sea to the Himalayas. He was undefeated in battle and is considered one of history's most successful commanders.
Alexander succeeded his father, Philip II of Macedon, to the throne in 336 BC after Philip was assassinated. Upon Philip's death, Alexander inherited a strong kingdom and an experienced army. He was awarded the generalship of Greece and used this authority to launch his father's military expansion plans. In 334 BC, he invaded Persian-ruled Asia Minor and began a series of campaigns that lasted ten years. Alexander broke the power of Persia in a series of decisive battles, most notably the battles of Issus and Gaugamela. He subsequently overthrew the Persian King Darius III and conquered the entirety of the Persian Empire. At that point, his empire stretched from the Adriatic Sea to the Indus River.