<P> The empire linked the Indian Ocean maritime trade with the commerce of the Silk Road through the Indus valley, encouraging long - distance trade, particularly between China and Rome . The Kushans brought new trends to the budding and blossoming Gandhara art and Mathura art, which reached its peak during Kushan rule . </P> <P> H.G. Rowlinson commented: </P> <P> The Kushan period is a fitting prelude to the Age of the Guptas . </P> <P> By the 3rd century, their empire in India was disintegrating and their last known great emperor was Vasudeva I . </P>

According to the map 20-1 the capital city of isfahan is in which empire