Delhi

Delhi was the site of ancient Indraprastha (Khandavprastha), the mythical capital of the Pandavas during the Mahabharata.Delhi re-emerged as a major political, cultural and commercial city along the trade routes between northwest India and the Gangetic plain during the Delhi Sultanate era.

In AD 1639, the Mughal emperor Shah Jahan built a new walled city named Shahjahanabad, in Delhi, which served as the capital of the Mughal Empire from 1649 until the Rebellion of 1857. Shahjahanabad today is Old Delhi. The greater part of Old Delhi is still confined within the space of Shah Jahan's walls, and several gates built during his rule—the Kashmiri Gate, the Delhi Gate, the Turkman Gate, and the Ajmeri Gate—still stand.

The area around Delhi was probably inhabited before the second millennium BC, and there is evidence of continuous inhabitation since at least the 6th century BC. The city is believed to be the site of Indraprastha, the legendary capital of the Pandavas in the Indian epic Mahabharata. The earliest architectural relics date back to the Maurya period (c. 300 BC); in 1966, an inscription of the Mauryan Emperor Ashoka (273–236 BC) was discovered near Srinivaspuri. Remains of eight major cities have been discovered in Delhi. The first five cities were in the southern part of present-day Delhi. Anang Pal of the Tomara dynasty founded the city of Lal Kot in AD 736. The Chauhans conquered Lal Kot in 1180 and renamed it Qila Rai Pithora.

Delhi-

The king Prithviraj Chauhan was defeated in 1192 by a Tajik invader from Afghanistan, Muhammad Ghori, who made a concerted effort to conquer northern India. By 1200, native Hindu resistance had begun to crumble, the dominance of foreign Muslim dynasties in India was to last for the next five centuries. On the death of Muhammad in 1206, the Turkic slave-general, Qutb-ud-din Aibak, broke away from the Ghurid Dynasty and became the first Sultan of Delhi. He began construction of the Qutb Minar and Quwwat-al-Islam (might of Islam) mosque, the earliest extant mosque in India. Qutb-ud-din faced widespread Hindu rebellions and it was his successor, Iltutmish (1211–36), who consolidated the Muslim conquest of northern India.

For the next three hundred years, Delhi was ruled by a succession of Turkic and an Afghan, Lodhi dynasty. They built a number of forts and townships that are part of the seven cities of Delhi.Delhi was a major centre of Sufism during this period.The Mamluk Sultanate (Delhi) was overthrown in 1290 by the Khilji dynasty (1290–1320). Under the second Khilji ruler, Ala-ud-din Khilji, the Delhi sultanate extended its control south of the Narmada River in the Deccan. The Delhi sultanate reached its greatest extent during the reign of Muhammad bin Tughluq (1325–1351). In an attempt to bring the whole of the Deccan under control, he moved his capital to Daulatabad, Maharashtra in central India, but by moving away from Delhi he lost control of the north and was forced to return to Delhi to restore order. The southern provinces then broke away. In the years following the reign of Firoz Shah Tughlaq (1351–1388), the Delhi sultanate rapidly began to lose its hold over its northern provinces. Delhi was captured and sacked by Timur Lenk in 1398.Near Delhi, Timur massacred 100,000 captives.Delhi's decline continued under the Sayyid dynasty (1414–1451), until the sultanate was reduced to Delhi and its hinterland. Under the Afghan Lodhi dynasty (1451–1526), the Delhi sultanate recovered control of the Punjab and the Gangetic plain to once again achieve domination over northern India. However, the recovery was short-lived and in 1526 the sultanate was destroyed by Babur, founder of the Mughal dynasty.

In 1526, Babur, a descendant of Genghis Khan and Timur, from the Fergana Valley in modern-day Uzbekistan, invaded India, defeated the last Lodhi sultan in the First Battle of Panipat and founded the Mughal Empire that ruled from Delhi and Agra.The Mughal dynasty ruled Delhi for more than three centuries, with a sixteen-year hiatus during the reign of Sher Shah Suri, from 1540 to 1556. In 1553, the Hindu king, Hemu Vikramaditya acceded to the throne of Delhi by defeating forces of Mughal Emperor Humayun at Agra and Delhi. However, the Mughals re-established their rule after Akbar's army defeated Hemu during the Second Battle of Panipat in 1556.Shah Jahan built the seventh city of Delhi that bears his name Shahjahanabad, which served as the capital of the Mughal Empire from 1638 and is today known as the Old City or Old Delhi.

After 1720, the Mughal Empire's influence declined rapidly as the Hindu Maratha Empire rose to prominence. In 1737, Maratha forces sacked Delhi following their victory against the Mughals in the First Battle of Delhi. In 1739, the Mughal Empire lost the huge Battle of Karnal in less than three hours against the numerically outnumbered but military superior Persian army led by Nader Shah of Persia during his invasion after which he completely sacked and looted Delhi, the Mughal capital, carrying away immense wealth including the Peacock Throne, the Daria-i-Noor, and Koh-i-Noor. The Mughals, severely further weakened, would never overcome this crushing defeat and humiliation which would also let the way open for more invaders to come, including eventually the British. Nader eventually agreed to leave the city and India after forcing the Mughal emperor Muhammad Shah I to beg him for mercy and granting him the keys of the city and the royal treasury. A treaty signed in 1752 made Marathas the protectors of the Mughal throne in Delhi.

In 1757, the Afghan ruler, Ahmad Shah Durrani, sacked Delhi. He returned to Afghanistan leaving a Mughal puppet ruler in nominal control. The Marathas again occupied Delhi in 1758, and were in control before their defeat in 1761 at the third battle of Panipat, and the city was captured again by Ahmad Shah. However, in 1771, the Marathas established a protectorate over Delhi when the Maratha ruler, Mahadji Shinde, recaptured Delhi and the Mughal Emperor Shah Alam II was installed as a puppet ruler in 1772. In 1803, during the Second Anglo-Maratha War, the forces of British East India Company defeated the Maratha forces in the Battle of Delhi. During the Indian Rebellion of 1857, Delhi fell to the forces of East India Company after a bloody fight known as the Siege of Delhi. The city came under the direct control of the British Government in 1858. It was made a district province of the Punjab. In 1911, it was announced that the capital of British held territories in India was to be transferred from Calcutta to Delhi. The name "New Delhi" was given in 1927, and the new capital was inaugurated on 13 February 1931. New Delhi, also known as Lutyens' Delhi, was officially declared as the capital of the Union of India after the country gained independence on 15 August 1947.During the partition of India, thousands of Hindu and Sikh refugees, mainly from West Punjab fled to Delhi, while many Muslim residents of the city migrated to Pakistan. Migration to Delhi from the rest of India continues (as of 2013), contributing more to the rise of Delhi's population than the birth rate, which is declining.

The Constitution (Sixty-ninth Amendment) Act, 1991 declared the Union Territory of Delhi to be formally known as the National Capital Territory of Delhi