Helwan ( , , ) is a suburban district in the Southern Area of Cairo, Egypt. The area of Helwan witnessed prehistoric, ancient Egyptian, Roman and Muslim era activity. More recently it was designated as a city until as late as the 1960s, before it became contiguous with the city of Cairo and was incorporated as a district. For a brief period between April 2008 and April 2011it was redesignated as a city, and served as the capital of the now defunct Helwan Governorate that was split from Cairo and Giza governorates, before being re-incorporated back into them. The kism of Helwan had a population of 643,327 in the 2006 census. History The Helwan and Isnian cultures of the late Epipalaeolithic, and their Ouchata retouch methods for creating microlithic tools may have contributed to the development of the Harifian cultural assemblage of the Sinai, which may have introduced Proto-Semitic languages into the Middle East. Around 3000 to 2600 BC, there was a cemetery near Helwan serving the city of Memphis. The city of Helwan was founded in 689 CE as Fustat's temporary replacement as the capital of Umayyad Egypt by its governor Abd al-Aziz ibn Marwan, who died in the new city. The Khedivial Astronomical Observatory was built here 1903–1904, and was used to observe Halley's comet. Egypt's oldest and largest private psychiatric clinic, the Behman Hospital, was constructed here in 1939. During the early part of the 20th century, the city was the site of RAF Helwan, a major British airfield, which was later used by the Egyptian Air Force. In 1959 Helwan was chosen to serve as a site of a major industrial city, as part of President Gamal Abdel Nasser's attempts to industrialize Egypt. Throughout the 1960s, it developed into a massive steelworks zone, with numerous automobile factories being built. The site continues to use electricity from the Aswan Dam and iron ore from Egypt's western deserts. Helwan was gradually transformed into a mass suburb of Cairo for the working class. Helwan Governorate In April 2008, the Helwan Governorate was split from the Cairo Governorate, encompassing most of the districts outside the ring road, as well as all satellite cities (15th May, New Cairo, Shorouk, Badr, and Huckstep) and the undeveloped desert. Helwan was elevated to city status, incorporating the districts of al-Ma'sara, 'Ain Helwan (qism Helwan), and al-Mustaqbal (prev. 15th May), and became the capital of