This man offered the secret Reinsurance Treaty to a neighboring country after the Three Emperors' League broke down. In one meeting called by this man, he worked with Prince Gorchakov to revise the treaty of San Stefano, enlarging Bulgaria. Succeeded by Leo Caprivi, he threatened Schleswig-Holstein, attempted to remove Catholic influences in his country's Kulturkampf, and edited the Ems telegram to provoke the Franco-Prussian War. For 10 points, 
This man offered the secret Reinsurance Treaty to a neighboring country after the Three Emperors' League broke down. In one meeting called by this man, he worked with Prince Gorchakov to revise the treaty of San Stefano, enlarging Bulgaria. Succeeded by Leo Caprivi, he threatened Schleswig-Holstein, attempted to remove Catholic influences in his country's Kulturkampf, and edited the Ems telegram to provoke the Franco-Prussian War. For 10 points, name this advisor to Kaiser Wilhelm I, an "Iron Chancellor" who helped unify Germany.
This man offered the secret Reinsurance Treaty to a neighboring country after the Three Emperors' League broke down.
Otto von Bismarck