The date inscribed in the oldest Philippine document found so far, the Laguna Copperplate Inscription, is 900 AD. From the details of the document, written in Kawi script,i the bearer of a debt, Namwaran, along with his children Lady Angkatan and Bukah, are cleared of a debt by the ruler of Tondo. It is the earliest document that shows the use of mathematics in precolonial Philippine societies. A standard system of weights and measures is demonstrated by the use of precise measurement for gold, and familiarity with rudimentary astronomy is shown by fixing the precise day within the month in relation to the phases of the moon. From the various Sanskrit terms and titles seen in the document, the culture and society of Manila Bay was that of a Hindu–Old Malay amalgamation, similar to the cultures of Java, Peninsular Malaysia and Sumatra at the time.