Ibn Khordadbeh
Ibn Khordadbeh clearly mentions Waqwaq twice: "East of China are the lands of Waqwaq, which are so rich in gold that the inhabitants make the chains for their dogs and the collars for their monkeys of this metal. They manufacture tunics woven with gold. Excellent ebony wood is found there." And again: "Gold and ebony are exported from Waqwaq."