15th century generally: Sultanate of Brunei starts to expand over Borneo. Hong China sends caravans along the Silk Road to Choresm, starting diplomatic relations. Since 1400: Nipponese start copying Chinese arms (bamboo guns, cannons) - the first ones are smuggled in - , and improving them. 1400-02 (3097, Yang Metal Dragon / 3099, Yang Water Horse): First voyage of Chinese Treasure Ships. They travel to Pasai (Sumatra), Melaka (OTL Malacca), Ayutthaya, Khmer, Pagan, to arrive in Calicut. 1403 (3100, Yin Water Sheep): China establishes a trade post at Aparri, Luzon, OTL Philippines.