(1900) According to
Ya'qubi, the plans for the city were drawn up, but it was not until 2 August 762 that construction began, under the supervision of four architects. Huge resources were amassed for the project: the Arab chroniclers report 100,000 workers and craftsmen, and sums of 18 million
gold dinars or 100 million silver
dirhams. The caliphal
Palace of the Golden Gate and the
main mosque, as well as some of the administration offices, were apparently completed by 763, allowing al-Mansur to move his residence into the city, and the rest of the Round City was completed by 766. Mansur believed that Baghdad was the perfect city to be the capital of the Islamic empire under the
Abbasids. Mansur loved the site so much he is quoted saying, "This is indeed the city that I am to found, where I am to live, and where my descendants will reign afterward". The goal was to replace
Harran as the seat of the caliphal government; however, a city of Baghdad is mentioned in pre-Islamic texts, including the
Talmud, and the Abbasid city was likely built on the site of this earlier settlement. Baghdad eclipsed
Ctesiphon, the capital of the
Sasanian Empire, which was located some to the southeast, which had been under Muslim control since 637, and which became quickly deserted after the foundation of Baghdad. The site of
Babylon, which had been deserted since the 2nd century, lies some to the south. The old Baghdad was a small village, and despite its name, which is of
Iranian origin (
bag "god" +
dād "gifted"), the original inhabitants were probably
Aramaic-speaking
Nabateans. The new city, however, was mainly
Arabic-speaking, with considerable
Persian elements in the population and urban environment, although there may not have been any major Persian settlement in the village of Baghdad or its surrounding communities: all of which were absorbed into the new city of Baghdad. Rather, the Persian elements appeared after the foundation of the new city, and included
Persian architectural influence, early Persian military settlement, continuous immigration by Persian scholars, and the late arrival of rulers of Persian origin (such as the
Buyids). The city was designed as a circle about in radius, leading it to be known as the "Round City". Given this figure, it may be estimated that the original area of the city, shortly after its construction, was around (However, the historical sources do not agree on the size of the city.) The original design shows a ring of residential and commercial structures along the inside of the city walls, but the final construction added another ring, inside the first. In the center of the city lay the caliphal palace, the mosque, as well as headquarters for guards. The purpose or use of the remaining space in the center is unknown. The circular design of the city was a direct reflection of the traditional Persian
Sasanian urban design. The ancient Sasanian city of Gur/
Firouzabad is nearly identical in its general circular design, radiating avenues, and the government buildings and temples at the center of the city. This points to the fact that it was based on Persian precedents. and
Mashallah ibn Athari, a Persian Jewish astrologer/astronomer. The city had
four gates: Bab al-Kufa ("gate of
Kufa"), Bab al-Sham ("gate of
al-Sham or
Damascus"), Bab al-Khorasan ("gate of
Khorasan"), and Bab al-Basra ("gate of
Basra"). This too is similar to the round cities of Darabgard and Gor, which had four gates. The Khorasan Gate marked the beginning of the
Great Khorasan Road. None of the structures of the city has survived, and information are based on literary sources. The caliphal
Palace of the Golden Gate and the main mosque were located at the centre of the circle. Influenced by the
apadana design of ancient
Iranian architecture, the mosque was built with a
hypostyle prayer-hall with wooden columns supporting its flat roof. The caliphal palace featured an
iwan and a dome-chamber immediately behind it, resembling
Sasanian palace design (such as that of Gor and
Sarvestan). Building materials was mostly brick (sometimes strengthened by reeds), reflecting
Mesopotamian architecture. == Modern references to the "discovery" of the Round City ==