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