Shōgun

Minamoto no Yoritomo, 1178, within his lifetime. The wiki's programme: leave your Bloc at game start and found your own, inviting independent house heads; run hunts and prestige activities; take Assert Regional Dominion when it appears; and use Demand Aspiration Change so every house in your Bloc shares your Aspiration - cohesion rockets, and you need 75 of it (which is most of Bloc Politics done, incidentally). When your Bloc outmuscles the sitting Daijō-daijin, run an Install Ruling Regent faction and press the demand - fight if you must. Then as Daijō-daijin: Legitimacy and Prestige to level 4, crown authority to 3 (Powerful Ministries), and take the Formalize Shogunate decision. Needs All Under Heaven.