Sahiwal District (Punjabi and ), formerly known as Montgomery district, is a district in the Punjab province of Pakistan. In 1998, it had a population of 1,843,194 people, 16.27% of which were in urban areas. Since 2008, Sahiwal District, Okara District, and Pakpattan District have comprised the Sahiwal Division. The city of Sahiwal is the capital of the district and the division. History The Sahiwal District has been settled from the pre-historical era. Harappa is an archaeological site, about west of Sahiwal, that was built approximately 2600 BCE. The area was part of South Asian empires and in crossroads of migrations and invasions from Central Asia. Sahiwal District was an agricultural region with forests during the Indus Valley civilization. The Vedic period is characterized by Indo-Aryan culture which split from Indo-Iranian culture and founded in Northern Indian subcontinent. The Kambojas, Daradas, Kaikayas, Madras, Pauravas, Yaudheyas, Malavas and Kurus invaded, settled and ruled ancient Punjab region. After overrunning the Achaemenid Empire in 331 BCE, Alexander marched into present-day Punjab region with an army of 50,000. The Sahiwal was ruled by Maurya Empire, Indo-Greek kingdom, Kushan Empire, Gupta Empire, White Huns, Kushano-Hephthalites and the Turk and Hindu Shahi kingdoms. From the beginning of the 7th century Rajput kingdoms dominated Eastern portions of Pakistan and northern India. In 997 CE, Sultan Mahmud Ghaznavi, took over the Ghaznavid dynasty empire established by his father, Sultan Sebuktegin, In 1005 he conquered the Shahis in Kabul in 1005, and followed it by the conquests of some western Punjab region. Eastern Regions of Punjab from Multan to the Rawalpindi in north (Including region of present-day Sahiwal) remained under Rajput rule until 1193. The Delhi Sultanate and Mughal Empire later ruled the region. The Punjab region became predominantly Muslim due to missionary Sufi saints whose dargahs dot the landscape of Punjab region. The pastoral tribes of this barren expanse did not appear to have paid more than a nominal allegiance to the Muslim rulers; the population for the most part remained in a chronic state of rebellion. After the decline of the Mughal Empire, this area became part of the Sikh Empire. The district came under direct British rule in 1849, when the district was officially formed with its headquarters at Pakpattan. The district was expanded to include the trans-Ravi portion in 1852, and the district headquarters were moved to Gugera. In 1865, when the railway was opened,