Ranald was not only a colorful character, but an important one. You can click on the image to read the plaque. There are also descriptions of his life on this web page and in Wikipedia. On the lower right of the Wikipedia page, you'll see a portrait monument to Ranald in Nagasaki.
As I took the photo, I wondered if fellow City Daily Photo blogger, Nori, would be the only viewer of this post who could read the plaque in both languages.