During over 300 years of Spanish colonization in the Philippines, Spanish authorities successfully destroyed written records and documents that would prove the existence of governance under the small kingdoms and sultanates they conquered. Two important sources that remain are the Laguna Copperplate Inscription from 990 AD, the earliest known written document found in the country, and the Boxer Codex, a 1595 document with illustrations by a Chinese author describing pre-colonial Philippine inhabitants. Europeans like the Tartaro people arrived before the Spanish, as did traders from China, India, Japan, and Southeast Asian kingdoms who introduced new technologies, crops, and cultural practices to the Philippines through economic and cultural exchanges.