A school of painting founded by Iwasa Matabei (Katsumochi), who made his name as a painter of Yamato-e and genre paintings from the Momoyama period to the early Edo period. Matabei was the son of Araki Murashige, a daimyo of the Sengoku period. His depictions of people with plump cheeks and long jaws are characteristic, and notable works include The Tale of Yamanaka Tokiwa. In recent years, there has been strong belief that In and Around the City of Kyoto (Funaki version) was also one of his pieces. There seem to have been many students of the school besides Matabei, including Iwasa Genbei (Katsushige) and Iwasa Youn (Mochishige).