War of the Guelphs and Ghibellines
| Guelph-Ghibelline wars | |||||||||
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| Part of Investiture Controversy | |||||||||
 Painting of the Guelph and Ghibelline families, by Ottavio Baussano (Asti). |
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| Belligerents | |||||||||
 House of WelfSupported by:  Papal States Lombard League Kingdom of Naples.svg){kind=small} Kingdom of France
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 House of StaufenSupported by: .svg){kind=small} Holy Roman Empire Kingdom of Sicily
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| Commanders and leaders | |||||||||
.svg){kind=small} Azzo VII d'Este William VII of Montferrat Alberto da Giussano Ottaviano degli Ubaldini Guido I da Montefeltro Charles I of Naples
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 Frederick I Barbarossa Henry VII Ezzelino III da Romano Enzo of Sardinia Manfred of Sicily †
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| Units involved | |||||||||
| Armies of the Papal States Cities' guards |
Army of the Holy Roman Empire Cities' guards |
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| Strength | |||||||||
| Unknown | Unknown | ||||||||
The Guelphs and Ghibellines (/ɡwɛlfs/; /ˈɡɪbᵻlaɪnz/, also US /ˈɡɪbəliːnz/, /ˈɡɪbələnz/; Italian: guelfi e ghibellini [ˈɡwɛlfi e ɡɡibelˈliːni]) were factions supporting the Pope and the Holy Roman Emperor, respectively, in the Italian city-states of central and northern Italy. During the 12th and 13th centuries, rivalry between these two parties formed a particularly important aspect of the internal politics of medieval Italy. The struggle for power between the Papacy and the Holy Roman Empire had arisen with the Investiture Controversy, which began in 1075 and ended with the Concordat of Worms in 1122. The division between the Guelphs and Ghibellines in Italy, however, persisted until the 15th century.
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