Columbus: Ougon no Yoake(1992)

A nautical strategic RPG hybrid action in the vein of Uncharted Waters. You follow the life of Christopher Columbus as he goes from rookie captain to his landing in America. After a few tutorial missions, you get turned loose on an open world to build fame for yourself by doing quests, slaying rare monsters holed up in dungeon areas, etc., until a King of a prominent country can be convinced to support your expedition to the New World.