Merovingian and Carolingian Dynasty
Both the Merovingians and the Carolingians were part of the Franks, a Barbarian group. The Merovingians however, ruled the Franks for nearly 300 years, it was their leader Clovis, son of Childeric I, who united all of Gaul under the Merovingian rule.
After Clovis’ death, both of his sons took over the kingdom. However, they fought amongst themselves throughout the sixth century. They began slaughtering each other, family against family. As a result, by the mid-seventh century, the Frankish army began to sacrifice women and children in order to satisfy the battle spirits, leaving them with many mental defectives. The Merovingians were also unskilled administrators which led their rule into a fall.
By the late eighteenth century, the Carolingians consolidated its power, holding the office of mayor of the palace and becoming the de facto rulers of the Franks. It was in the year 751 AD that the Merovingians were deprived of their rule with the consent of the Papacy and aristocracy. The Pope blessed the change of dynasty, and Pepin the Short, a Carolingian, was crowned as the new king of the Franks.
Conclusively, the Merovingians lost their chance to keep ruling, because of their major problems, and the Carolingians took over.
The Papal-Frankish Alliance
Between the years 756 and 857 the Papacy began to seek a new ally and protector. The Byzantine Empire was not ideal anymore to carry that job. This is because they became unreliable, and even they began to harass the Popes.
On the other hand, the Carolingians were on the rise, and constantly victorious. This led the Pope to consider them as their new protection and ally. It was the Pope Stephen II to meet with Pepin the Short and supplicate him to protect them from the Lombards who had been pressuring the Papacy. Eventually, Pepin agrees to protect the Papacy, and defeats the Lombards. The land then is given to the Pope Stephen II, which is called to be the donation of Pepin. This territory ends up leading to the origin of the Papal States.
In conclusion, the Byzantine Empire was removed from being the protector and ally of the Papacy, and the Carolingians took over the alliance, making it the “Papal-Frankish Alliance”.