汪大渊
It was recorded in 1320 that the Mongol sent a mission to obtain elephants from "Long Ya Men" (龍牙門, "Dragon's Teeth Gate"). The people of "Longyamen" then responded in 1325 with a tribute and trade mission to China. "Long Ya Men" is believed to be the entrance to Keppel Harbour. In his work "Daoyi Zhilüe", Wang Dayuan described "Long Ya Men" as the two hills of Temasek that looked like "Dragon's teeth" between which a strait runs, and wrote about the place: