Foundation
On 30 July 762 the caliph Al Mansur commissioned the construction of the city and it was built under the supervision of the Barmakids. 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 city's growth was helped by its location, which gave it control over strategic and trading routes, along the Tigris. A reason why Baghdad provided an excellent location was the abundance of water and the dry climate. Water exists on both north and south ends of the city gates, allowing all households to have a plentiful supply, which was very uncommon during this time.
Baghdad eclipsed Ctesiphon, the capital of the Persian Empire, which was located some 30 km (19 mi) to the southeast. Today, all that remains of Ctesiphon is the shrine town of Salman Pak, just to the south of Greater Baghdad. Ctesiphon itself had replaced and absorbed Seleucia, the first capital of the Seleucid Empire. Seleucia had earlier replaced the city of Babylon.
In its early years the city was known as a deliberate reminder of an expression in the Qur'an, when it refers to Paradise. Four years before Baghdad's foundation, in 758, Mansur assembled engineers, surveyors, and art constructionists from around the world to come together and draw up plans for the city. Over 100,000 construction workers came to survey the plans; many were distributed salaries to start the building of the city. July was chosen as the starting time because two astrologers, Naubakht Ahvaz and Mashallah, believed that the city should be built under the sign of the lion, Leo. Leo is associated with fire and symbolises productivity, pride, and expansion.
The bricks used to make the city were 18 inches (460 mm) on all four sides. Abu Hanifa was the counter of the
