Mary Helena Cornwall Legh, also known as was a British Anglican missionary, who late in life devoted herself to the welfare, education and medical care of leprosy patients in Kusatsu, Gunma Prefecture, Japan.

Kusatsu is a town located in Gunma Prefecture, Japan. In September 2020, the town had a population of 6,255, in 3,407 households, and a population density of 130 persons per km2. The total area of the town is 249.75 square kilometres (96.43 sq mi). Kusatsu is one of the most famous hot springs resorts in Japan.