Arte da Lingoa de Iapam

The Arte da Lingoa de Iapam (lit. 'Art of the Tongue of Japan'; Japanese: 日本大文典, romanized: Nihon Daibunten) is an early 17th-century Japanese grammar written in Portuguese. It was compiled by João Rodrigues, a Portuguese Jesuit missionary. It is the oldest fully extant Japanese grammar and is a valuable reference for the late middle period of the Japanese language.