Ancient Near East continents (Europe, Asia, and Africa), including apart from its core in modern-day Iran, the territories of modern Iraq, the Caucasus (Armenia, Georgia, Azerbaijan, Dagestan, Abkhazia), Asia Minor (Turkey), Thrace, Bulgaria, Greece, many of the Black Sea coastal regions, northern Saudi Arabia, Jordan, Israel, Lebanon, Syria, Afghanistan, Central Asia, parts of Pakistan, and all significant population centers of ancient Egypt as far west as Libya. It is noted in western history as the foe of the Greek city states in the Greco-Persian Wars, for freeing the Israelites from their Babylonian captivity, and for instituting Aramaic as the empire's official language. Ancient
Ancient Greek phonology and this cluster underwent metathesis early in the Ancient Greek period. Metathesis is likely in this case; clusters of a voiced stop and , like , do not occur in Ancient Greek, since they change to by assimilation (see below), while clusters with the opposite order, like , pronounced , do occur. Ancient grammarians, such as Aristotle in his "Poetics" and Dionysius Thrax in his Art of Grammar, categorized letters () according to what speech sounds ( 'elements') they represented. They called the letters for vowels ('pronounceable', singular ); the letters for the nasals, liquids, and , and the letters