This leader is accompanied by the angel Genius and threatens Saint Peter with war in a dialogue written after this leader's death. This leader employed the battle cry of "expel the barbarians" while trying to capture the coast near Cesena. This leader led troops at the Siege of Mirandola before the army was defeated by a force partly led by Alfonso d'Este at the Battle of Ravenna. An army of Swiss mercenaries hired by this leader installed Maximilian Sforza as Duke of Milan. After the Battle of Polesella, this leader broke an alliance with Maximilian I ("the first") and Louis XII ("the twelfth") by ending his involvement (10[1])in the League of (-5[1])Cambrai against Venice. This leader took control of the papal armies after deposing his rival Alexander VI's ("the sixth's") son Cesare Borgia. For 10 points, name this ■END■ (10[1])