The correct answer to this open question is the following.
Although there are no options attached we can say the following.
The role that the Frankish leaders played in creating a "new" Europe after the fall of the Roman Empire was the following.
The Merovingian Dynasty grew in power and presence in the region to the degree that the pope crowned Charlemagne as the Holy Roman Emperor on December 25, 800 AD. The pope accepted the protection of Charlemagne and he became the official protector of the Catholic Church at that time.
Charlemagne and his descendants belonged to the Carolingian dynasty and the Frankish King Clovis belonged to the Merovingian dynasty. In 987, Hughes Capet was elected king of France, which made him the first king of the Capetian dynasty.
Frankish aristocrats founded the Carolingian Dynasty. Indeed, it was Charles Martell who defeated the Moors in Spain and stopped the fast spread of Islam to western Europe in the Battle of Tours in 732. With the important victory, Martell was renown as the savior of Christianity in that part of Europe. The descendants of Martell were the Carolingians. Little by little, the Pope began to favor the Carolingians instead of the Merivingeas.