Who is Matsui Iwana from The Rape of Nanking and what is their importance?

Matsui Iwana was another leader of Japanese military troops in the invasion of Nanking. Matsui , in contrast to Nakajima, was a devout Buddhist, and the commander in chief for the Japanese imperial army for the Shanghai-Nanking region. When Matsui was stricken with illness, he was replaced by a member of the royal family, Asaka Yasuhiko. Asaka not only had full power over the military of the Nanking region, but also knew Nakajima and Yanagawa personally. When Matsui later recovered and entered Nanking, he was astonished at the atrocities committed, and attempted several times to alert military leaders that actions should be taken to stop the soldiers.