Alexander - To The World's End  Catherine - Catherine's Flying Squadron  Montezuma - Gifts for the Tlatoani [28+1=29] +1 Combat Strength from each Luxury resource lasts throughout the entire game. If you start near another continent it gets even better. Plus 2 extra cities benefiting from 1 amenity is helpful. Qin Shi Huang - The First Emperor [28-3=25] I can imagine if a policy card (Feudalism) gave not only the big important Leader Ability of another Civ but even doubled that bonus then that Civ would be long gone by now. People aren't upvoting China because of the bonus production towards wonders (which only lasts for a couple of eras), that isn't one of the very best leader abilities in the game, nor is building the great wall. It's because of the +1 builder charge, and both a single policy card and a governor promotion outdo that ability. Monty, Alexanders, Tomyris's, Trajans and Shakas leader abilities are stronger. Shaka - Amabutho  Tomyris - Killer of Cyrus  Trajan - Trajan's Column  Pity to see Persia go so early. That +2 movement can be absolutely devastating in the early game when you've got Immortals, it can the deciding factor in a war. Plus it lasts throughout the entire game.