Arte da Lingoa de Iapam

His Arte da Lingoa de Iapam is the oldest extant complete Japanese grammar.

In addition to vocabulary and grammar, it includes details on the country's dynasties, currency, measures, and other commercial information.

Following a violent suppression of marauding Japanese sailors in Macao in 1608 and court intrigues the next year, however, Tokugawa resolved to replace Portuguese traders with red seal ships, the Dutch, and the Spanish in early 1610.

After a successful assault on a Portuguese ship then in Nagasaki Bay, he permitted most of the missionaries to remain but replaced Rodrigues with the Englishman William Adams.

Landresse as Elements of Japanese Grammar (Elémens de la Grammaire Japonaise) in 1825, with a supplement added the next year.