Tales of the Diwali of the Pharaohs, which lighted up the pyramids and the whole Nile area, and later its adoption by the Persians, is said to have inspired the Mughals to fall in love with the festival of lights. When they saw how it was observed in Delhi, they began to hail it as Jashan-e-Chiraghan.
(R.V. Smith is a historian of Delhi)