Little is known of Anangpal, who whose ancestors had settled in the Aravalli Hills around the end of the first millennium CE. Some archaeological evidence survives of earlier settlements in the area and may be related to a ruler called Surajpal. Of Anangpal, the primary source for information comes from the Prithviraj Raso, a history of Prithviraj Chauhan which was written much later. Some sources say that physical evidence at Lal Kot (literally Red Fort, not to be confused with the present day Red Fort), which he is thought to have built and which is the oldest identifiable city in the area, suggests that he lived in the eleventh century but others state that it was the 8th century.
- Blake, Stephen P. (2002). Shahjahanabad: The Sovereign City in Mughal India 1639-1739. Cambridge University Press. pp. 7–9. ISBN 9780521522991.
- Khushwant Singh (2001). City improbable: an anthology of writings on Delhi. Viking. p. 5. ISBN 978-0-670-91235-3.
- Mukherji, Anisha Shekhar (2002). The red fort of Shahjahanabad. Delhi: Oxford University Press. p. 46. ISBN 9780195657753.