Seleucia (; Ancient Greek: Σελεύκεια), also known as Seleucia-on-Tigris, Seleucia on the Tigris or Seleucia ad Tigrim, was a major Mesopotamian city, located on the west bank of the Tigris River within the present-day Baghdad Governorate in Iraq. It was founded around 305 BC by Seleucus I Nicator as the first capital of the Seleucid Empire, and remained an important center of trade and Hellenistic culture after the imperial capital relocated to Antioch. The city continued to flourish under Parthian rule beginning in 141 BC; ancient texts claim that it reached a population of 600,000. Seleucia was destroyed in 165 AD by Roman general Avidius Cassius and gradually faded into obscurity in the subsequent centuries. The site was rediscovered in the 1920s by archaeologists.
Names Seleucia (Ancient Greek: Σελεύκεια, Seleúkeia) is named for Seleucus I Nicator, who enlarged an earlier settlement and made it the capital of his empire around 305 BC. It was the largest and most important of the many cities to bear its name but is sometimes distinguished as Seleucia-on-Tigris or Seleucia on the Tigris (Latin: Seleucia ad Tigridem) from the name of its river. Texts from the Church of the East's synods referred to the city as Salīq (Syriac: ܣܠܝܩ) or some times Māḥôzē (Syriac: ܡܚܘܙ̈ܐ) when referring to the metropolis of Seleucia-Ctesiphon. The Sassanids named the eastern city as Veh-Ardashir (Persian: ویهاردشیر); Arabs called it Bahurasīr.
History
Seleucid Empire
Seleucia, as such, was founded as the first capital of the Seleucid Empire by Seleucus I Nicator. A foundation date of 300 BC was proposed by Auguste Bouch-Leclerq in 1914. Other scholars proposed 306 BC and 312 BC. Seleucus was one of the Diadochi successors of Alexander the Great who, after Alexander's death, divided his empire among themselves. Although Seleucus soon moved his main capital to Antioch, in northern Syria, Seleucia became an important center of trade, Hellenistic culture, and regional government under the Seleucids.
To make his capital into a metropolis, Seleucus forced almost all inhabitants of Babylon, except the local temple priests/supporting workers, to leave and resettle in Seleucia. A tablet dated 275 BC states that the inhabitants of Babylon were transported to Seleucia, where a palace and a temple (Esagila) were built. Standing at the confluence of the Tigris River with a major canal from the Euphrates, Seleucia was placed to receive traffic from both great waterways. During the 3rd and 2nd centuries BC, it was one of the great Hellenistic cities, comparable to Alexandria in Egypt, and greater than Syrian Antioch. Excavations indicate that the walls of the city enclosed an area of at least 550 hectares (1,400 acres), equivalent to a square roughly 1.5 miles (2.5 kilometers) on a side. Based on this size, the population has been estimated to number over 100,000 initially and probably more later. Its surrounding region might have supported half a million people. Polybius (5,52ff) uses the Macedonian peliganes for the council of Seleucia, which implies a Macedonian colony, consistent with its rise to prominence under Seleucus I; Pausanias (1,16) records that Seleucus also settled Babylonians there. Archaeological finds support the presence of a large population not of Greek culture.
In 141 BC, the Parthians under Mithridates I conquered the city, and Seleucia became the western capital of the Parthian Empire. Tacitus described its walls, and mentioned that it was, even under Parthian rule, a fully Hellenistic city. Ancient texts claim that the city had 600,000 inhabitants, and was ruled by a senate of 300 people. It was clearly one of the largest cities in the Western world; only Rome, Alexandria, and possibly Antioch were more populous. In 55 BC, a battle fought near Seleucia was crucial in establishing dynastic succession of the Arsacid kings. In this battle between the reigning Mithridates III (supported by a Roman army of Aulus Gabinius, governor of Syria) and the previously deposed Orodes II, the reigning monarch was defeated, allowing Orodes to re-establish himself as king. In 41 BC, Seleucia was the scene of a massacre of around 5,000 Babylonian Jewish refugees (Josephus, Ant. xviii. 9, § 9). In 117 AD, Seleucia was burned down by the Roman emperor Trajan during his conquest of Mesopotamia, but the following year it was ceded back to the Parthians by Trajan's successor, Hadrian, then rebuilt in the Parthian style. It was completely destroyed by the Roman general Avidius Cassius in 165.
Sasanian rule
Over sixty years later a new city, Veh-Ardashir, was built across the river by Persian emperor Ardashir I. This new city was long believed to be located at Seleucia but was shown by Italian excavations to be a fresh construction separate from Seleucia and Ctesiphon. There were active Christian churches in Mesopotamia from the 1st century onwards and in the 3rd or 4th century Seleucia became an important centre.
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