Iraq, officially the Republic of Iraq, a country in West Asia, and the geopolitical region called the Middle East. Starting as early as the 6th millennium BCE, the fertile alluvial plains between Iraq's Tigris and Euphrates Rivers, referred to as the region of Mesopotamia, gave rise to some of the world's earliest cities, civilizations, and empires. It was known as a "Cradle of Civilisation" that saw the inventions of a writing system, mathematics, timekeeping, a calendar, astrology, and a law code. Following the Muslim conquest, Baghdad became the capital and the largest city of the Abbasid Caliphate. During the time of the Islamic Golden Age, the city evolved into a significant cultural and intellectual center, and garnered a worldwide reputation for its academic institutions, including the House of Wisdom.
Early Mesopotamian Civilizations (circa 5000–2900 BCE)
Ancient Iraq, known as Mesopotamia, saw the rise of the Ubaid culture (circa 5000–4000 BCE), marked by advanced irrigation systems and distinctive pottery. The succeeding Uruk period (circa 4000–3100 BCE) introduced the world's first cities, including Uruk, where monumental architecture and cuneiform writing emerged. By the Early Dynastic Period (circa 2900–2350 BCE), city-states like Ur and Lagash engaged in territorial conflicts, fostering administrative sophistication and legal codification.
Akkadian and Neo-Sumerian Periods (circa 2350–2004 BCE)
The Akkadian Empire (circa 2350–2150 BCE), founded by Sargon of Akkad, established the first multiethnic empire, centralizing political and economic systems. However, internal strife and external invasions led to its collapse. The Neo-Sumerian Ur III dynasty (circa 2112–2004 BCE) revived Sumerian culture, standardizing administrative practices and undertaking massive ziggurat construction, before succumbing to Elamite invasions and Amorite incursions.
Old Babylonian and Kassite Periods (circa 2000–1155 BCE)
The Old Babylonian Empire (circa 1894–1595 BCE) under Hammurabi (r. 1792–1750 BCE) codified laws in the famous Code of Hammurabi. This period saw the blending of Sumerian and Akkadian traditions but was destabilized by Hittite and Kassite invasions. The Kassites (circa 1595–1155 BCE) ruled for centuries, emphasizing continuity by preserving Babylonian culture, although their control waned due to Assyrian and Elamite pressures.
Middle and Neo-Assyrian Periods (circa 1400–609 BCE)
The Middle Assyrian Empire (circa 1400–1050 BCE) expanded militarily, consolidating power under rulers like Tiglath-Pileser I. The Neo-Assyrian Empire (911–609 BCE) became the most powerful state in the ancient Near East, pioneering advanced military tactics and imperial administration. Notable rulers like Ashurbanipal collected vast libraries, including the one at Nineveh, but internal dissent and a coalition of Babylonians and Medes led to its fall.
Neo-Babylonian Period (626–539 BCE)
The Neo-Babylonian Empire, founded by Nabopolassar, revived Babylon's glory, achieving architectural and cultural zeniths under Nebuchadnezzar II, who expanded the city and built the Hanging Gardens (as per legend). This period ended with Cyrus the Great of Persia conquering Babylon in 539 BCE, marking the transition to Achaemenid rule and the decline of indigenous Mesopotamian autonomy.
Achaemenid to Parthian Periods (539 BCE–224 CE)
Under Achaemenid rule, Mesopotamia became a vital administrative and economic center, with its cities maintaining prominence within the empire's satrapal system. Alexander the Great’s conquest (331 BCE) integrated Mesopotamia into the Hellenistic world, followed by Seleucid and then Parthian control, during which Mesopotamia served as a cultural and military frontier, witnessing continued urban prosperity despite shifting political dynamics.
Sasanian Period (224–651 CE)
With the rise of the Sasanian Empire in 224 CE, Mesopotamia, particularly its western regions, became a critical frontier against the Roman (and later Byzantine) Empire. The Sasanians revitalized agriculture through advanced irrigation systems, while cities like Ctesiphon flourished as administrative and cultural centers. Zoroastrianism became the dominant state religion, although the region's diverse population included Christians, Jews, and pagans. Frequent wars with Byzantium, culminating in the devastating Byzantine-Sasanian War (602–628 CE), weakened the empire and left Mesopotamia vulnerable to the Islamic conquests.
Early Islamic Caliphates (651–1258 CE)
After the Muslim conquest of Persia in 651 CE, Mesopotamia became a pivotal part of the Rashidun, Umayyad, and later Abbasid Caliphates. Baghdad, founded in 762 CE by the Abbasids, became a global center of learning, commerce, and culture during the Islamic Golden Age. Advances in science, philosophy, and medicine flourished, but the region faced cycles of prosperity and decline, including incursions by the Seljuks and Mongols. The 1258 CE Mongol sack of Baghdad marked a catastrophic end to Abbasid dominance, devastating Mesopotamia’s infrastructure and intellectual heritage.
Mongol to Early Modern Periods (1258–1534 CE)
Following the Mongol invasions, Mesopotamia fragmented into smaller territories under the Ilkhanate and subsequent Turkic-Mongol successor states. The Black Death and continuous warfare further destabilized the region. By the 15th century, the region oscillated between control by the Safavids and the rising Ottoman Empire, reflecting broader geopolitical rivalries in the Islamic world.
Ottoman Period (1534–1918 CE)
Mesopotamia became an Ottoman province after Suleiman the Magnificent’s conquest in 1534 CE. The Ottomans introduced administrative reforms but struggled to fully integrate the region due to tribal dynamics and resistance. By the 19th century, Ottoman centralization efforts and modernization projects, including urban development and transportation, clashed with local autonomy. World War I saw the British occupation of the region, ending Ottoman rule.
Modern Period
Post-Ottoman Mesopotamia became the foundation of modern Iraq under the British Mandate (1920–1932) and later gained independence, becoming the Kingdom of Iraq in 1932. Its ancient heritage continues to shape its cultural identity, while its rich archaeological legacy offers insights into its pivotal role in human history.
Uruk, one of the earliest cities in human history, emerged during the 4th millennium BCE as a political, economic, and cultural hub in southern Mesopotamia. Situated near the Euphrates River, it marked a critical transition from agrarian villages to complex urban centers. At its peak during the Uruk period (circa 4000–3100 BCE), the city spanned nearly 200 hectares, featuring monumental architecture such as the Anu Ziggurat and the Eanna precinct, dedicated to the goddess Inanna. Uruk was the birthplace of many innovations, including the development of the first writing system, cuneiform, and significant advances in administrative practices. Explore Uruk
Babylon, situated on the Euphrates River in central Mesopotamia, rose to prominence during the early 2nd millennium BCE as a center of political and cultural power. First mentioned in texts during the Akkadian period, it gained significance under the Amorite king Hammurabi (r. 1792–1750 BCE), who unified much of southern Mesopotamia and established Babylon as the capital of a burgeoning empire. The city’s influence endured through subsequent periods, with its name becoming synonymous with grandeur and innovation. Explore Babylon
Nimrud, known as Kalhu in antiquity, was a major city of the Assyrian Empire, located on the Tigris River in northern Mesopotamia. Founded in the early 2nd millennium BCE, it gained prominence during the reign of Ashurnasirpal II (r. 883–859 BCE), who made it the capital of the Neo-Assyrian Empire. The city became a showcase of imperial power, with vast palaces, temples, and monumental reliefs that celebrated military victories and divine favor. The Northwest Palace, adorned with intricate stone carvings and inscriptions, exemplified Assyrian architectural and artistic prowess. Explore Nimrud
The reconstruction of the Babylonian Processional Street in the Pergamon Museum, Berlin, represents one of the most ambitious efforts to preserve and interpret Mesopotamian heritage. Originally leading to the Ishtar Gate in ancient Babylon, the Processional Street was a grand thoroughfare adorned with vivid reliefs of lions, symbolizing the goddess Ishtar’s power. Excavated in the early 20th century by German archaeologist Robert Koldewey, the glazed bricks and fragments were meticulously cataloged and transported to Berlin, where they were reassembled using modern techniques. This reconstruction, while partial, provides an unparalleled glimpse into Babylonian engineering and artistry and highlighting the sophistication of their urban design. Explore Processional Street
Ur, one of the most significant cities of ancient Sumer, flourished on the southern Mesopotamian plain near the Euphrates River. Occupied from the Ubaid period (circa 5000 BCE) through the early first millennium BCE, Ur reached its zenith during the Third Dynasty of Ur (circa 2112–2004 BCE). It served as the capital of a powerful Sumerian state, known for its centralized administration, legal systems, and monumental architecture. The city’s most iconic structure, the Great Ziggurat of Ur, dedicated to the moon god Nanna, exemplifies Sumerian religious and architectural sophistication. Explore Ancient Ur
The "Gates of Nineveh", constructed during the reign of Sennacherib (r. 705–681 BCE) as part of his extensive urban renovation program, the city’s walls extended over 12 kilometers and featured 15 monumental gates, each serving both defensive and ceremonial purposes. These gates, named after gods and adorned with colossal stone lamassu—winged, human-headed bulls—symbolized divine protection and the king’s authority. Functioning as entry points to one of the most powerful cities of the ancient world, they also facilitated trade and administrative control. Explore Gates of Nineveh
Nippur, situated in central Mesopotamia, was a sacred city that played a pivotal role in Sumerian religion and culture. Unlike other city-states, it was not a political capital but served as the religious heart of Sumer and later Mesopotamian civilizations. Dedicated to Enlil, the chief deity of the Sumerian pantheon, its central feature was the Ekur temple complex, which symbolized divine authority and cosmic order. Nippur’s status as a neutral and holy city made it a hub for diplomatic activity and cultural exchange among competing city-states. Explore Nippur
Taq Kasra, the remains of a grandiose archway in Ctesiphon, once stood as the monumental gateway to the capital of the Sassanian Empire. Constructed during the 6th century CE under the reign of Khosrow I, this massive structure was part of a royal palace complex and symbolized the architectural ambition of the Sassanian rulers. The arch, which once spanned an impressive 25 meters in height, was the largest of its kind in the ancient world, demonstrating advanced engineering techniques and the use of brick as a primary building material. Its form, with its vaulted, semi-circular design, influenced later Islamic and Byzantine architecture. Explore Taq Kasra
The Processional Street of ancient Babylon, one of the most significant elements of the city's grand architectural legacy, continues to undergo excavation and restoration efforts at the original site in Iraq. Although the grand and beautiful street decorations have been taken to Berlin the on site remains and their reconstruction provides an insight in to how it might have looked at the time of its construction. Explore Babylonian Street
Nineveh, the last great capital of the Neo-Assyrian Empire, stood on the eastern bank of the Tigris River near modern Mosul. First settled as early as the 7th millennium BCE, it reached its zenith during the reign of Sennacherib (r. 705–681 BCE), who transformed it into a political, cultural, and architectural masterpiece. Enclosed by massive walls stretching over 12 kilometers, Nineveh housed sprawling palaces, temples, and the famed Library of Ashurbanipal, which preserved thousands of cuneiform texts, including the Epic of Gilgamesh. Its position at the crossroads of major trade routes enhanced its wealth and cosmopolitan nature. Explore Nineveh
Ancient Assur, located along the Tigris River in northern Mesopotamia, was a key city of the Assyrian Empire. Initially a religious and trading center, Assur became the capital of the empire during the 14th century BCE, symbolizing its political and military power. The city was home to the Assyrian god Ashur, and the central temple dedicated to him was one of the most significant structures in the city, a symbol of Assyria's divine mandate. Archaeological findings reveal complex urban planning, including monumental gates, palaces, and fortifications. The city's strategic location on the trade routes between Anatolia, the Levant, and Mesopotamia facilitated both commerce and military expansion. Explore Assur
Hatra, an ancient city located in modern-day northern Iraq, emerged as a thriving metropolis during the Parthian Empire in the 1st century BCE. It stood at the crossroads of trade routes between the Roman Empire, Parthia, and Arabia, making it a vital commercial and cultural hub. Hatra was fortified with imposing walls and a series of grand temples, showcasing a unique blend of Hellenistic, Roman, and local Mesopotamian architectural styles. The city is especially renowned for its resistance to Roman conquest: in 198 CE, the Roman emperor Septimius Severus launched a campaign to capture Hatra, but the city held out for several months before finally succumbing. Explore Hatra
Ancient Babylonia, located in southern Mesopotamia, was a region that played a crucial role in shaping the ancient world. Centered around the Euphrates River, its most famous city, Babylon, rose to prominence under the reign of King Hammurabi in the 18th century BCE. The region was characterized by fertile land that supported agricultural innovations, including advanced irrigation systems. Babylonia became a cultural and intellectual hub, known for its contributions to astronomy, mathematics, and law, with the Code of Hammurabi being one of the earliest and most influential legal texts. In the 6th century BCE, under King Nebuchadnezzar II, Babylon reached its peak, boasting monumental architecture such as the Ishtar Gate and the Hanging Gardens, one of the Seven Wonders of the Ancient World. Explore Babylonia
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