Share This Article 1. Sometime around 1781 James Monroe named his estate this. Brookwood Montpelier Long Branch Mount Pleasant 2. The so-called “July Plot” to kill Hitler is often referred to by this code name. Operation Valkyrie Operation Savior Operation Downfall Operation Wolfkill 3. On 10 April 1864 this man declared himself Emperor of Mexico. Ferdinand VII of Spain Archduke Maximilian of Austria Joseph Napoleon III of France Don Pedro II of Brazil Loading …