We understand from the passage that Shah Jahan ……… .

That evening we arrived in Delhi, the great walled city of the Mogul Empire, scattered with tombs and forts, many decayed or built over. Some scholars say that there are seven cities on the sites of Old and New Delhi, while some say more. The history is rich and stretches back centuries. At one time, Shah Jahan, the ruler who built the Taj Mahal, reconstructed Old Delhi, restoring large bazars and streets leading to the fortress. As there was no wall on the eastern side, where the River Yumuna flows; Delhi was sacked regularly over the centuries, the last time being in the eighteenth century, when the Persian ruler Nadir Shah looted treasures that included the Peacock Throne and the Koh-i-noor diamond.