Ancient Iranian refers to the culture and civilization of the Iranian people that existed before the Islamic conquest of Iran in the 7th century. ART from this period is represented by three letter word, ART. The language of Ancient Iran was Avestan, a seven letter word. The Medes were an ancient Iranian people who lived in the northwestern part of modern-day Iran. This is represented by the four letter word MEDE and the five letter word MEDES. The three letter word MDE is also related to the Medes.