In ancient times the whole or the greater part of the area between the Indus and the district have belonged to a Nagatribe called Takshakas, who gave their name to the city of Takshasila. Known as Taxila by the Greek historians, the location of the ancient city has been identified to be in the ruins of Shahdheri in the north-west corner of the District. At the time of Alexander's invasion Taxila was described by Arrian as a flourishing city, the greatest indeed between the Indus and the Hydaspes. Rawalpindi district was agricultural region with forests during the Indus Valley Civilization. The Vedic period is characterized by Indo-Aryan culture that invaded from Central Asia and settled in Punjab region. 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 Rawalpindi was ruled by Maurya Empire, Indo-Greek kingdom, Kushan Empire, Gupta Empire, White Huns, Kushano-Hephthalites and Shahi kingdoms.
Sultanate
In 997 CE, Sultan Mahmud Ghaznavi, took over the Ghaznavid dynasty empire established by his father, Sultan Sebuktegin. He conquered the Shahis in Kabul in 1005, and followed it by the conquests of northern Punjab region. The Delhi Sultanate and later Mughal Empire ruled the region. The Punjab region became predominantly Muslim due to missionary Sufi saints whose dargahs dot the landscape of Punjab region.
Mughal Era
Sultan Mahmud Ghaznavi passed through the District after his defeat of Anand Pal and capture of Ohind. The Gakhars, a tribe still of importance within the district trace their origins back to Mahmud of Ghanzi. The first mention of the Gakhars occurs in the memoirs of Babar, who gives an interesting account of the capture of their capital, Paralah. It was strongly situated in the hills, and was defended with great bravery by its chief Hati Khan, who escaped from one gate as the Mughal army marched in at the other. Hati Khan died by poison in 1525; his cousin and murderer Sultan Sarang then submitted to Babar, who conferred on him the area of Potwar. From that time on the Gakhar chieftains remained firm allies of the Mughal dynasty, and provided significant aid to the Mughal in their struggle against the house of Sher Shah. Salim Shah attempted in vain to subdue their country.
In 1553, Adam Khan, Sarang's successor, surrendered the rebel prince Kamran to Humayun. Adam Khan was subsequently deposed by Akbar, and his principality given over to his nephew Kamal Khan. During the height of the Mughal empire, the family of Sarang retained its territorial possessions. Its last and Gakhars chief, Mukarrab Khan, ruled over a kingdom which extended from the Chenab to the Indus.
British Era
In 1849, Rawalpindi passed with the rest of the Sikh dominions under British rule; and though tranquility was disturbed by an insurrection four years later, led by a Gakhar chief with the object of placing a pretended son of Ranjit Singh on the throne, its administration was generally peaceful until the outbreak of the Mutiny in 1857. The Dhunds and other tribes of the Murree Hills, incited by Hindustani agents, rose in insurrection, and the authorities received information from a faithful native of a projected attack upon the station of Murree in time to organize measures for defense. The women near the station, who were present in large numbers, were placed in safety, while the Europeans and police were drawn up in a cordon round the station. The rebels arrived expecting no resistance, but were met with organized resistance and were repelled.
The district of Rawalpindi was created during British rule as part of Punjab province. The district obtained its current boundaries in 1904 when Attock District was created as a separate district. According to the 1901 census of India, the population in 1901 was 558,699, an increase of 4.7% since 1891. During the period of British rule, Rawalpindi district increased in population and importance.