The earliest references to a fabulous land of gold that could be interpreted as places in South East Asia may be found in Indian literature. In Ramayana, there are mentions of Suvarnabhumi (Land of Gold) and Suvarnadvipa (the Golden Island or Peninsula, where dvipa might refer to either a peninsula or an island) Greek knowledge of lands further to their east improved after the conquests of Alexander the Great, but specific references to places in South East Asia did not appear until after the rise of the Roman Empire. Greek and Roman geographers Eratosthenes, Dionysius Periegetes, and Pomponius Mela had written about a Golden Isle (Khrysē, Chryse Insula), which some in modern times argued to mean Sumatra while excluding the Malay Peninsula. Pliny in Natural History, however, referred to Chryse as both a promontory and an island.