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| 1053 | Leo IX |  |
| Vatican Declares war on the Normans in South Italy |
| 1095 | Urban II | |
| 27th Nov Clermont Pope Urban II presides over the Council of Clermont and calls the First Crusade into being to free the Holy Places at Jerusalem |
| 27th Nov Clermont Preaches for the First Crusade at Clermont to free the Holy Places at Jerusalem |
| 1096 | Urban II | |
| 27th Nov Clermont Urban's call to arms to recapture the holy land begins the 1st Crusade |
| 1146 | Bernard | |
| Vezelay Preaches for the gathering of the 2nd Crusade, prompted by the loss of Edessa |
| 1239 | Gregory IX | |
| Gregory IX declares a Crusade against Frederick II |
| 1482 | Colonna, Prospero | |
| Naples Fights for Naples against Venice & the Pope |
| 1511 | Julius II | |
| Declares War against France |
| Threatens to excommunicate all those who fight with France |
| 1516 | Leo X | |
| Vatican Calls for Chris tendom to fight a Holy War against the Turks under Soleiman |
| 1526 | Clematises VII | |
| Fought between the Habsburg Charles V, Spain and the Holy Roman Empire, & the League of Cognac, an alliance including France, Pope Clement VII, the Republic of Venice, England, the Duchy of Milan & Florence |
| 1889 | Crispi, Francesco | |
| Menelik II cancels the protectorate agreement & Crispi annexes Italian Somaliland |
| 1911 | Giolitti, Giovanni | |
| 29th Sep Italy declares war on Turkey to conquer Libya & gain a foothold in nth Africa |
| 1914 | Giolitti, Giovanni | |
| Opposes Italian intervention in World War I |
| 1915 | Sonnino | |
| 23rd May Hands the declaration of war on Austria-Hungary to Baron Macchio |
| 1915 | Victor Emmanuel III | |
| 23rd May Signs the declaration of war on Austria-Hungary |
| 19th Oct Russia and Italy declare war on Bulgaria |
| 1916 | Boselli, Paolo | |
| Declares war on Germany |
| 1940 | Mussolini, Benito Amilicare Andrea | |
| 10th June Declares war on Britain & France after Germany has occupied France |
| 1943 | Badoglio, Pietro | |
| 13th Oct Italy declares war on Germany |
| 1943 | Mussolini, Benito Amilicare Andrea | |
| 13th Oct Italy declares war on Germany |
| 1943 | Victor Emmanuel III | |
| 13th Oct Italy declares war on Germany |
