Amemiya Keijiro (Japanese 雨宮 敬次郎 Amemiya Keijiro:, October 24, 1846 – January 20, 1911) was a Japanese entrepreneur, financier, and investor. One of the leaders of the regional Koshu Zaibatsu, a group of Koshu merchants who banded together to engage in business. His nickname was "king of speculators" (Japanese: 投機界の魔王) and "the railroad king of the Meiji era" (Japanese: 明治の鉄道王).
Source: “Keijiro Amemiya”, English Wikipedia (CC BY-SA 4.0), excerpt