The first possible written records of Singapore possibly date to the 2nd century, when the island was identified as a trading post in the maps of the Greek astronomer, Ptolemy.
It was recorded that in 1320, the Mongol Yuan Dynasty sent a mission to obtain elephants from a place called Longyamen (), known locally as Batu Berlayar in Malay, which is believed to be Keppel Harbour [REF].