who were some of its settlers during the ancient time?
the Pandavas, Mughals
Delhi
Delhi has been continuously inhabited since the 6th century BCE. Through most of its history, Delhi has served as a capital of various kingdoms and empires, most notably the Pandavas, the Delhi Sultanate and the Mughal Empire. The city has been captured, ransacked and rebuilt several times, particularly during the medieval period, and modern Delhi is a cluster of a number of cities spread across the metropolitan region. For many centuries Delhi has been a dominant trading and commercial centre in northern India, and after 1990s it has emerged as an important node in the international corporate and financial network. 
when did new delhi became the capital of india 13 February 1931 where is this place located? Indo-Gangetic Plain what is the total population of this place? New Delhi city has a population of 257,803 while New Delhi district has a population of 142,004. where is its name first believed to have originated? One of them is derived from "Dhillu" or "Dilu", a king who built a city at this location in 50 BCE and named it after himself.
wiki:19582524
Delhi [SEP] Introduction
Recent estimates of the metro economy of its urban area have ranked Delhi either the most or second-most productive metro area of India. Delhi is the second-wealthiest city in India after Mumbai and is home to 18 billionaires and 23,000 millionaires. Delhi ranks fifth among the Indian states and union territories in human development index. Delhi has the second-highest GDP per capita in India. Delhi is of great historical significance as an important commercial, transport, and cultural hub, as well as the political centre of India. Delhi has been continuously inhabited since the 6th century BCE. Through most of its history, Delhi has served as a capital of various kingdoms and empires, most notably the Pandavas, the Delhi Sultanate and the Mughal Empire.