Namban refers to the style of art connected with European missionaries and merchants in Japan during the 16th and 17th centuries, including Japanese artists painting in a Western style, European imported art, and traditonal Japanese art depicting Europeans. Taught by Jesuit priest Giovanni Niccolo in 1583, artists produced works in a traditional Western style, often religious in theme. Namban motifs include Western peoples, ships, rosaries, and crosses, found on folding screens, flasks, and lacquer ware.

Excerpt from

Getty Vocabulary, AAT (Namban (Japanese painting styles): AAT: 300018585)