Long ago, two groups fought.
Long ago, two groups fought in a land called Italy. 
Long ago, a great fight happened in Italy. It was the Siege of Pavia. It took place from 773 to 774. 

The Siege of Pavia was a major conflict in northern Italy. It took place between the years 773 and 774. 
Before the battle, many things went wrong between the two sides. Charlemagne had once married a daughter of Desiderius. However, he later ended the marriage and sent her home. This was seen as a big insult by the Lombards. Later, a woman named Gerberge fled to Pavia for safety. She was the wife of Charlemagne's brother, Carloman. Desiderius gave her help, which made the Franks very angry. The Pope also asked Charlemagne to help defend his lands. 
Charlemagne moved his army toward Italy in the early summer of 773. His army was very large, with 10,000 to 40,000 troops. He split his forces into two groups to cross the mountains. Charlemagne led one half through the Dora Susa pass. His uncle, Bernard, led the other half through the Great St Bernard Pass. The Frankish troops found a way around the Lombard defenses. This forced the Lombards to retreat into the walled city of Pavia. 
The siege of Pavia lasted for many months. Charlemagne used tactics to surround the city and block supplies. Because no food could get in, the people inside suffered. Famine and disease became very common in the city. Desiderius stayed in the city, but his son Adelchis fled to Constantinople. In the tenth month of the siege, the hunger was very bad. Finally, on a Tuesday in June, Desiderius opened the gates. He surrendered the city to Charlemagne. 
This victory changed history for many people. Charlemagne became the King of the Franks and the Lombards. This was rare because one ruler took the title of the people he beat. He also became a protector for the Church. This helped build the power of the Popes in Italy. Even today, people remember the siege through old stories. Some legends say Charlemagne built the church of Santa Sofia in just one day.
The Siege of Pavia was a massive military conflict in northern Italy. It took place between 773 and 774.
Several political tensions caused the war to begin. Charlemagne and King Desiderius once had an alliance through marriage. Charlemagne married Desiderius' daughter, Desiderata. However, Charlemagne later divorced her and sent her back home. The Lombards viewed this as a deep insult. Tensions grew when Gerberge, the wife of Charlemagne's brother Carloman, fled to Pavia. Desiderius gave her asylum and protected her children's rights to the Frankish throne. 
Charlemagne began his march toward Italy in the early summer of 773. His army was very large, containing between 10,000 and 40,000 troops. To cross the Alps, Charlemagne divided his forces in half. He led one group through the Dora Susa pass near Mont Cenis. His uncle, Bernard, led the second group through the Great St Bernard Pass. 
The siege itself relied on attrition tactics. Attrition means wearing down an enemy over a long period. The Frankish army used rudimentary engines and planned a prolonged encirclement. They used methods called vallation and contra-vallation to secure the area.
Inside the city, the situation became desperate. Desiderius remained in Pavia to lead. However, his son Adelchis left the city to guard the family of Carloman in Verona. Charlemagne sent a small force to besiege Verona, causing Adelchis to flee to Constantinople. In the early months of 774, Charlemagne began subduing the entire region around Pavia. He even visited the Pope in Rome during Easter. By the tenth month of the siege, famine was hitting Pavia extremely hard. On a Tuesday in June, Desiderius realized he was alone. He opened the gates and surrendered to Charlemagne.
The outcome of the siege had a massive political legacy. Charlemagne was declared the King of the Franks and the Lombards. This was a unique moment in the Early Middle Ages. It was rare for a ruler to take the specific title of the people he had conquered. This victory allowed Charlemagne to act as a protector for the Church. His support helped establish the temporal authority of the Papacy in central Italy. This laid the groundwork for what would become the Holy Roman Empire.
Many changes occurred in Italy following the Frankish conquest. The Lombard monarchy was destroyed, but the social changes were complex. Many Franks took positions of power in Italy. However, many Lombards kept their jobs because they were willing to make peace with Charlemagne. The fall of the Lombard state removed a major threat to the security of the Pope. This shift in power helped reshape the entire political map of Europe for centuries to come.
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