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Ram Khamhaeng was a son of Pho Khun Bang Klang Hao, who ruled as Pho Khun Si Inthrathit, and his queen, Sueang, though folk legend claims his real parents were an ogress named Kangli and a fisherman. He had two brothers and two sisters. The eldest brother died while very young. The second, Ban Mueang, became king following their father's death, and was succeeded by Ram Khamhaeng on his own death.