conquest of the Sasanian Empire in the medieval times, the Arab caliphates established their rule over the region for the next several centuries, during which the long process of the Islamization of Iran took place. Confronting the cultural and linguistic dominance of the Persians, beginning by the Umayyad Caliphate, the Arab conquerors began to establish Arabic as the primary language of the subject peoples throughout their empire, sometimes by force, further confirming the new political reality over the region. The Arabic term , denoting "people unable to speak properly", was adopted as a designation for non-Arabs (or non-Arabic speakers), especially the Persians. Although the term had developed a derogatory meaning and implied cultural and ethnic inferiority, it was gradually accepted as a synonym for "Persian" and still remains today as a designation for the Persian-speaking communities native to the modern Arab states of the Middle East. A series of Muslim Iranian kingdoms were later established on the fringes of the declining Abbasid Caliphate, including that of the ninth-century Samanids, under the reign of whom the Persian language was used officially for the first time after two centuries of no attestation of the language, now having received the Arabic script and a large Arabic vocabulary. Persian language and culture continued to prevail after the invasions and conquests by the Mongols and the Turks (including the Ilkhanate, Ghaznavids, Seljuks, Khwarazmians, and Timurids), who were themselves significantly Persianized, further developing in Asia Minor, Central Asia, and South Asia, where Persian culture flourished by the expansion of the Persianate societies, particularly those of Turco-Persian and Indo-Persian blends. After over eight centuries of foreign rule within the region, the Iranian hegemony was reestablished by the emergence of the Safavid Empire in the 16th century. Under the Safavid Empire, focus on Persian language and identity was further revived, and the political evolution of the empire once again maintained Persian as the main language of the country. During the times of the Safavids and subsequent modern Iranian dynasties such as the Qajars, architectural and iconographic elements from the time of the Sasanian Persian Empire were reincorporated, linking the modern country with its ancient past. Contemporary embracement of the legacy of Iran's ancient empires, with an emphasis on the Achaemenid Persian Empire, developed particularly under the reign of the Pahlavi dynasty, providing the motive of a modern nationalistic pride. Iran's modern architecture was then inspired by that of