In its early years, the city was known as a deliberate reminder of an expression in the Qur'an, when it refers to Paradise. It took four years to build (764–768). 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 Ahvazi and Mashallah, believed that the city should be built under the sign of the lion, Leo. Leo is associated with fire and symbolizes productivity, pride, and expansion.