Sakamoto Ryoma (aka Sakamoto Ryouma) is a cancelled adventure / RPG that was in development by Toshiba EMI (Toemiland) for the Famicom / NES. It seems that the game was based on the real-life leader of the movement to overthrow the Tokugawa shogunate during the Bakumatsu period in Japan (as we can read in Wikipedia). Ryoma has inspired at least 7 television drama series, 6 novels, 7 manga and 5 films, and in Live A Live, an RPG by Square released in 1994, Sakamoto appears as a playable character. No luck for Ryoma on the Famicom however: the project that was postponed many times until finally vanishing forever.
Thanks to Celine for the contribution! Screens from a Japanese website