The earliest historical record of local polities and kingdoms is the Laguna Copperplate Inscription, which indirectly refers to the Tagalog polity of Tondo (–1589) and two to three other settlements believed to be located somewhere near Tondo, as well as a settlement near Mt. Diwata in Mindanao, and the temple complex of Medang in Java. Although the precise political relationships between these polities is unclear in the text of the inscription, the artifact is usually accepted as evidence of intra- and inter-regional political linkages as early as 900 CE. By the arrival of the earliest European ethnographers during the 1500s, Tondo was led by the paramount ruler called a "Lakan". It had grown into a major trading hub, sharing a monopoly with the Rajahnate of Maynila over the trade of Ming dynasty products throughout the archipelago. This trade was significant enough that the Yongle Emperor appointed a Chinese governor named Ko Ch'a-lao to oversee it.