Due to its very good relations with Japan, the Japanese called Tondo as "Luzon", even a famous Japanese merchant, Luzon Sukezaemon, went as far as to change his surname from "Naya" to Luzon. Japan's interaction with Philippine states have precedence in the 700s when Austronesian peoples like the Hayato and Kumaso settled in Japan and culturally mediated with the locals and their Austronesian kin to the South, served at the Imperial court and sometimes waged battles in Japan. Japan also imported Mishima ware manufactured in Luzon. In 900 AD, the lord-minister Jayadewa presented a document of debt forgiveness to Lady Angkatan and her brother Bukah, the children of Namwaran. This is described in the Philippines' oldest known document, the Laguna Copperplate Inscription.