Minamotono Yoritomo (1147-1199) was the founder of the Kamakura shogunate (1192-1333). Military chronicles such as the Heike Monogatari, Gikeiki, and Gempei Jousuiki (Seisuiki) portray Yoritomo as shrewd, calculating, and even ruthless; however, it was these very qualities that enabled him to establish Japan's first worrior government, the basic structure of which would survive for nearly 700 years.
The commemorative stamp was issued on 2 September 1999 since the year marks the 800th anniversary of Yoritomo's death and the day has been chosen that the first day of issue postmark shows 1192 (the 11th year of Heisei, September 2nd: 1192 was the year when Yoritomo founded the Kamakura shogunae).