According to old texts, Tagalog is an Austronesian language with about
57 million speakers throughout the Philippines. Tagalog used to be
written using the Baybayin alphabet, which was believed to originate from Bali and Sumatra. The name Tagalog derives from taga-ilog (someone living by the river). The earliest known book in Tagalog is the Doctrina Cristiana published in 1593. It was written in both Spanish and Tagalog using both Baybayin and Latin alphabet.