A document was found in 1989 that was written in a much older and more complex writing system ever seen in the Philippines before.
On that day in 1989, a man in the concrete business was dredging sand at the mouth of the Lumbang River near Laguna de Ba’y when he uncovered a blackened roll of metal. Usually he would just throw away such junk, as it tended to get jammed in his equipment, but when he unfurled the roll he saw that it was a sheet of copper with strange writing on it, about the size of a magazine.
He offered the copper sheet to one of the antiques dealers in the area who bought it for next to nothing. The dealer, in turn, tried to sell it for a profit but when he found no buyers, he eventually sold it to the Philippine National Museum for just 2,000 pesos.
In 1990, Antoon Postma, a Dutch expert in ancient Philippine scripts and Mangyan writing, and a long-time resident of the Philippines, translated the document that came to be known as the Laguna Copperplate Inscription (LCI). When he saw that the writing looked similar to the ancient Indonesian script called Kavi, and that the document bore a date from the ancient Sanskrit calendar, he enlisted the help of fellow Dutchman, Dr Johann de Casparis, whose area of expertise was ancient Indonesia.
Casparis confirmed that the script and the words used in the Laguna document were exactly the same as those that were used on the island Java at the time stated in the document, which was the year 822, in the old Hindu calendar or the year 900 in the CE (Common Era)calendar.
In 1996, a Filipino history buff in California, Hector Santos, precisely converted the Sanskrit date over to our calendar by using astronomical software and some historical detective work. He determined that the Sanskrit date written on the plate was exactly Monday, April 21, 900 CE