Birthright

Needs Roads to Power. As a landless adventurer with the Legitimist purpose, win a claim war for a kingdom or empire. Master Todor (1178) makes it almost unfair: 10,000 special troops, deep pockets, high prestige, aged 24. Get a royal claim - Orthodox adventurers can simply BUY one from the Patriarch in Constantinople - declare, and let the doomstack argue your case. Alternative entries: lose as Harold in 1066 and carry on landless, or unland yourself as Prince Pascueten. Same adventurer toolkit as Band of Brothers.